Solid Waste Services, Inc., d/b/a J.P. Mascaro & Sons v. WCAB (Boos) ( 2021 )


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  •            IN THE COMMONWEALTH COURT OF PENNSYLVANIA
    Solid Waste Services, Inc., d/b/a        :
    J.P. Mascaro & Sons,                     :
    Petitioner      :
    :
    v.                    :   No. 441 C.D. 2020
    :   Submitted: September 18, 2020
    Workers’ Compensation Appeal             :
    Board (Boos),                            :
    Respondent         :
    BEFORE:     HONORABLE RENÉE COHN JUBELIRER, Judge
    HONORABLE MICHAEL H. WOJCIK, Judge
    HONORABLE ELLEN CEISLER, Judge
    OPINION NOT REPORTED
    MEMORANDUM OPINION BY
    JUDGE COHN JUBELIRER                         FILED: March 31, 2021
    Solid Waste Services, Inc., d/b/a J.P. Mascaro & Sons (Employer) petitions
    for review of the Order of the Workers’ Compensation Appeal Board (Board) that
    affirmed the Decision of a Workers’ Compensation Judge (WCJ) granting Mark
    Boos’s (Claimant) Claim Petition. On appeal, Employer argues that the Board erred
    in affirming because: (1) the WCJ’s finding that Claimant’s work-related laceration
    became infected was not supported by substantial evidence; (2) Claimant’s medical
    expert’s causative testimony was equivocal and, therefore, legally incompetent; and
    (3) the award of ongoing disability benefits was impermissibly based on the mere
    possibility that Claimant’s symptoms will recur in the future. Upon review, we
    affirm because substantial evidence supported the WCJ’s findings, Claimant’s
    medical expert’s testimony was not equivocal, and the award of ongoing benefits
    was not based on the potential that Claimant might have future symptoms, but on a
    finding that Claimant’s symptoms are ongoing.
    I. Background
    A. Claim Petition
    On October 10, 2017, Claimant filed the Claim Petition alleging that, on
    March 21, 2017, he was knocked off of a truck at a landfill and sustained a work-
    related injury in the nature of a laceration to his lower left leg that resulted in
    Claimant developing an autoimmune disease. (WCJ Decision, Finding of Fact
    (FOF) ¶ 1; see Claim Petition, Reproduced Record (R.R.) at 8a.) Claimant sought
    total disability benefits ongoing from March 21, 2017. Employer filed an answer
    denying the Claim Petition’s material allegations.
    The matter was assigned to the WCJ, who held two hearings. At the first
    hearing, on November 3, 2017, the WCJ held a preliminary discussion with counsel,
    and at the second, on April 11, 2018, Claimant testified live before the WCJ and
    offered photographic and documentary evidence, as well as the trial deposition
    testimony of Sean McCall, D.O., a board-certified internist (Claimant’s Expert).
    Employer presented the trial deposition testimony of Samuel Valenti, M.D., also a
    board-certified internist (Employer’s Expert).
    B. Claimant’s Evidence
    In support of his Claim Petition, Claimant testified as follows.1 Claimant
    worked for Employer as a tractor-trailer driver, hauling garbage from New Jersey to
    Keystone Landfill in Dunmore. On March 21, 2017, while maneuvering his truck
    on to a tipper machine at Keystone Landfill, Claimant fell out of his truck and into
    1
    Claimant’s testimony is summarized in Findings of Fact 3-7, and the transcript of that
    testimony is found at pages 97a-139a of the reproduced record.
    2
    the garbage pit, cutting his left leg on a piece of metal. Claimant immediately called
    his supervisor and explained what happened. He washed the laceration with saline
    solution and, two hours later, went to Employer’s office, where he was instructed to
    seek treatment at Northeast Rehabilitation in Scranton. At Northeast Rehabilitation,
    Claimant saw Employer’s Expert, who cleaned the laceration and prescribed
    Claimant antibiotics. Thereafter, Claimant returned to work in a limited capacity,
    seeing Employer’s Expert on several more occasions. On one of those “visit[s,]
    [C]laimant recalled expressing concern to [Employer’s Expert] that he still had pus[]
    coming out of the wound.” (FOF ¶ 5.) Employer’s Expert “cleaned the wound and
    released [C]laimant to full[-]duty work.” (Id.)
    After resuming work driving the tractor-trailer, Claimant recalled an incident,
    which he testified occurred approximately one month after his accident, in which his
    left foot became swollen and he had to cut his boot off. While Claimant took
    approximately two days off from work, the swelling eventually subsided, and he
    returned to work for approximately two to three weeks. A second swelling episode
    occurred in June 2017, this time in Claimant’s hands, which prevented him from
    driving, and so Employer assigned him office duties. It is at this point that Claimant
    saw Claimant’s Expert, who prescribed Prednisone and referred Claimant to David
    M. Pugliese, D.O., a rheumatologist.
    Dr. Pugliese examined Claimant and authored a note in August 2017
    explaining that Claimant was under his care for inflammatory arthritis, which
    interfered with Claimant’s ability to safely work, and suggesting that Claimant be
    given two to four weeks off from work. (Id.) Dr. Pugliese referred Claimant to an
    immunologist, Yoon Kim, D.O., who saw Claimant twice, ordered bloodwork, and
    adjusted Claimant’s medications. Claimant testified that swelling like that which
    3
    occurred in his feet and hands occurred elsewhere, including his tongue, mouth,
    esophagus, and throat. As a result, Claimant carries an Epinephrine pen and
    Prednisone. “Claimant has not returned to work in any capacity since August 30,
    2017.” (Id.) Claimant identified various photographs of his body, including one
    showing the injury to his leg “approximately two weeks after the [laceration]
    occurred,” (R.R. at 105a; R.R. at 149a), and others showing swelling in various parts
    of Claimant’s body, (id.at 117a-25a).
    Claimant’s Expert testified by deposition as follows.2 Claimant has been his
    patient since approximately 2014, and, with respect to Claimant’s work accident,
    Claimant’s Expert first saw Claimant on June 15, 2017, at which time Claimant
    complained of severe swelling in both hands. Claimant reported having a work
    injury that resulted in a leg wound, which ultimately became infected. Claimant’s
    Expert stated: “I do believe he did have an infection based upon [Employer’s
    Expert’s] description o[f] the laceration and the fact that [Employer’s Expert] started
    him on dual antibiotic therapy . . . .” (FOF ¶ 10 (quoting Claimant’s Expert’s
    Deposition (Dep.) at 12, R.R. at 182a).) After a second visit on July 5, 2017, at
    which Claimant complained of tongue swelling, shortness of breath, and difficulty
    swallowing, Claimant’s Expert diagnosed Claimant with angioedema “presumably
    due to an adverse reaction to [the medication] Plaquenil.” (Id. ¶ 11 (quoting
    Claimant’s Expert’s Dep. at 13, R.R. at 183a).) Though the diagnosis of angioedema
    remained unchanged, “the [etiology] has not inasmuch as [C]laimant has been off
    Plaquenil ever since and the angioedema has persisted.” (Id.) Claimant saw
    Claimant’s Expert two more times – on September 29, 2017, and March 13, 2018 –
    and was examined by several specialists, including Dr. Pugliese, Dr. Kim, and Amit
    2
    Claimant’s Expert’s deposition testimony is summarized in Findings of Fact 8-17, and
    the transcript of that deposition testimony is found at pages 172a-221a of the reproduced record.
    4
    Sharma, M.D., an infectious disease doctor, whose office notes Claimant’s Expert
    reviewed.3
    Claimant’s Expert expressed his opinion “that [C]laimant has angioedema
    with no causative bacteria or [etiology], apparently, according to the immunologist.”
    (Id. ¶ 14.) Specifically, Claimant’s Expert testified:
    Something is flaring it up, and we have a suspicion and a reasonable
    certainty that, from the timeline that I have been taking care of
    [Claimant], I believe his issues started shortly after his leg injury, and
    have never totally resolved, and have flared-up off and on since that
    time.
    (Id. (quoting Claimant’s Expert’s Dep. at 21, R.R. at 191a).) He stated that Claimant
    had none of these problems before March 21, 2017.                     On direct examination,
    Claimant’s Expert testified as follows:
    Q.     As a result of your treatment of [Claimant], your understanding
    of his injury, also the review of [Employer’s Expert’s] records, and, by
    the way, the review of that photograph [showing the laceration], do you
    have an opinion within a reasonable degree of medical certainty as to
    whether or not the injury which caused the laceration also resulted in
    an infection?
    A.     It’s my opinion that that injury did relate, did cause an infection
    to [Claimant].
    Q.     And, Doctor, the next opinion based on your treatment and
    treatment of referral physicians within your medical group, and your
    occasion to review their opinions, and also your occasion to continue
    to treat [Claimant], do you have an opinion within a reasonable degree
    of medical certainty as to, number one, the diagnosis, which I believe
    you already stated, but you can state it again.
    A.      Angioedema.
    3
    On the day of his deposition, Claimant’s Expert reviewed for the first time the office notes
    of Employer’s Expert. (FOF ¶ 9.)
    5
    Q.     And, Doctor, based on the history, the medical background as
    you understood [Claimant’s] condition to be prior to March 21, 2017,
    up until today’s date, whether or not there’s a connection between his
    injury, the laceration, infection, and the angioedema?
    A.     I believe there is a connection between the infection and the
    angioedema, as it never was present before, and it surfaced fairly soon
    after his injury.
    Q.     Is that opinion based within a reasonable degree of medical
    certainty?
    A.     Yes, it is.
    (R.R. at 192a-93a.) While acknowledging that angioedema can result from a variety
    of causes, Claimant’s Expert believed causes other than the infection had been ruled
    out by the specialists to which Claimant was referred. (FOF ¶ 15; R.R. at 194a.)4 In
    response to the question of whether Claimant is “disabled for driving tractor-trailer,”
    Claimant’s Expert responded:
    I would consider him disabled, because when he has these flare-ups,
    they are potentially life-threatening, as the tongue can swell, he can get
    short of breath, his hands can swell substantially to the point where it
    does inhibit safe control of steering wheels and reaction times and
    things like that, in my opinion.
    (R.R. at 194a.)
    On cross-examination, Claimant’s Expert testified that, while he reviewed a
    photograph of the laceration of Claimant’s leg, he had not seen other photographs
    showing Claimant’s swollen feet, lips, tongue, and the rashes on his body.
    4
    On redirect examination, Claimant’s Expert was questioned whether causative factors
    other than infection had been ruled out, to which he answered: “The factors that I would have
    thought of as an internist? Yes. I would have deferred to the immunologist to make sure all the
    other causes would have been ruled out.” (R.R. at 209a.)
    6
    Claimant’s Expert was presented with a September 8, 2017 note written by Dr.
    Pugliese, which Claimant’s Expert read into the record:
    [Claimant] has an inflammatory arthritis and has asked if it could be
    related to an injury and infection that he obtained at work. I’ve
    explained to him that there are many theories about the development of
    autoimmune disease. While one of them does suggest that a genetically
    predisposed person could have expression of his or her autoimmunity
    triggered by infection/trauma or another in[citing] event, there’s no way
    to prove cause and effect. The temporal profile in this case does fit the
    pattern, but, [] again, there’s no way to prove causality.
    (FOF ¶ 16 (quoting Claimant’s Expert’s Dep. at 38-39, R.R. at 208a-09a).) On
    redirect examination, when asked whether an infection is an accepted cause of
    angioedema, Claimant’s Expert stated that “[i]t could be one, yes.” (R.R. at 209a.)
    In addition, Claimant’s Expert was presented with another note from Dr. Pugliese,
    dated January 3, 2018, which he read into the record:
    [Claimant] has developed severe angioedema that is related to an
    infection that he got at work. The angioedema has been persistent and
    has interfered with his ability to at times swallow and even breath[e].
    In addition to the angioedema[,] there has been pain and fatigue and
    rash. He is currently unable to work as a result of this. He is being
    referred to multiple specialists, including immunology and infectious
    disease in addition to my care in rheumatology. He’s on multiple
    medications to help manage this, but to date we have not been able to
    control the disease.
    It is my opinion that[,] within a certain degree of medical certainty[,]
    [Claimant’s] decline is a direct result of the infection that he got in
    March.
    (FOF ¶ 17 (quoting Claimant’s Expert’s Dep. at 42-43, R.R. at 212a-13a).)
    7
    C. Employer’s Evidence
    Employer’s Expert examined Claimant on four occasions in March and April
    of 2017 and testified by deposition as follows.5 On March 21, 2017, the date of
    Claimant’s injury, Employer’s Expert described Claimant’s laceration as superficial
    in that the skin was together, it was not bleeding, and “there was no significant
    manifestation of an infective process.” (Id. ¶ 18.) Employer’s Expert cleaned the
    laceration with Betadine and peroxide, dressed the wound with a bandage, and
    prescribed Claimant antibiotics out of concern for “the potential of infection” given
    where Claimant fell. (R.R. at 294a-95a.) In an unscheduled visit 48 hours later,
    Claimant presented with increased pain and concern about drainage from the wound.
    Employer’s Expert noticed “no significant manifestation of an infection.” (Id. at
    296a.) At Claimant’s third visit to Employer’s Expert, Claimant reported that the
    drainage was improving but the discomfort in his leg persisted. Employer’s Expert
    directed Claimant to finish his antibiotics and return in a week. At Claimant’s final
    visit on April 3, 2017, Employer’s Expert noted good scab formation, minimal
    scarring, and found no evidence of an infective process. “[H]is impression . . . was
    that the laceration healed nicely”; he found no need for further treatment. (FOF
    ¶ 21.)
    Employer’s Expert “[did not] believe that any autoimmune phenomenon [is]
    [] related to [Claimant’s] work injury . . . .” (Id. ¶ 23 (quoting Employer’s Expert’s
    Dep. at 26, R.R. at 307a).) Employer’s Expert explained that, in order to trigger the
    expression of autoimmunity, “the trauma needs to be significant enough or the
    medical process [must] be [] severe enough for the body to recognize itself as foreign
    and develop a significant immune or autoimmune response to itself.” (Id. (quoting
    Employer’s Expert’s deposition testimony is summarized in Findings of Fact 18-25, and
    5
    the transcript of that deposition testimony is found at pages 282a-343a of the reproduced record.
    8
    Employer’s Expert’s Dep. at 27, R.R. at 308a).) Here, Employer’s Expert opined
    that the trauma Claimant experienced was “not significant enough to create a[n
    autoimmune] response.” (R.R. at 309a.)
    When asked on cross-examination whether Claimant had an infection,
    Employer’s Expert responded: “I don’t believe he did.” (FOF ¶ 25 (quoting
    Employer’s Expert’s Dep. at 40-41, R.R. at 321a-22a).) According to Employer’s
    Expert’s notes pertaining to his physical examination of Claimant, there was good
    healing, no drainage, no erythema, and no induration. Based on Employer’s Expert’s
    interpretation of Claimant’s treatment records, while “there was a concern of an
    autoimmune disease, as well as inflammatory arthritide, [] the actual diagnosis . . .
    was [not] stated.” (Id. (quoting Employer’s Expert’s Dep. at 45, R.R. at 326a).)
    D. WCJ Decision
    The WCJ summarized the parties’ relevant evidence as follows. Claimant cut
    his leg while on the job, (id. ¶ 26a), and thereafter experienced bouts of swelling,
    (id. ¶¶ 26d-26f), which he did not experience prior to his work injury, (id. ¶ 26g).
    Based on that history, and Claimant having been prescribed antibiotics and reseen
    by Employer’s Expert, Claimant’s Expert “gathered [C]laimant had an infection.”
    (Id. ¶ 26h.) Claimant’s Expert opined that “there is a connection between the
    infection and [Claimant’s diagnosis of] angioedema as it was never present before
    and surfaced soon after his injury.” (Id. ¶ 26j.) The symptoms Claimant experiences
    are “potentially life threatening” and Claimant is thus “disabled from returning to
    work . . . .” (Id. ¶ 26k.) Employer’s Expert saw Claimant four times following his
    injury, at the first visit characterizing Claimant’s laceration as “superficial,” (id. ¶
    26p), and at the second visit noting drainage from Claimant’s leg, which Claimant
    and Employer’s Expert had some concern about, (id. ¶ 26q). Claimant experienced
    9
    continued discomfort, but at Claimant’s final visit, Employer’s Expert observed that
    Claimant’s laceration “healed nicely and scab formation was strong.” (Id. ¶ 26s.)
    Employer’s Expert “does not believe [C]laimant’s autoimmune phenomenon is
    related to [C]laimant’s work injury” because the inciting trauma must be severe, and
    here “[C]laimant’s trauma was mild in nature.” (Id. ¶ 26t.)
    After considering the evidence, the WCJ “accepted as most credible and
    convincing the testimony of [C]laimant . . . as well as [Claimant’s Expert].” (Id.
    ¶ 27.) The WCJ attached significant weight to the fact that Claimant’s Expert,
    having seen Claimant as far back as 2014, “was clearly in a position to offer credible
    testimony that [C]laimant did not have any of the types of problems or symptoms
    that [Claimant’s Expert] found [C]laimant to have prior to March 21, 2017.” (Id.
    ¶ 28.)     Unlike Employer’s Expert, Claimant’s Expert examined Claimant and
    tracked his symptoms in the months following Claimant’s injury when he began
    experiencing swelling. Moreover, the WCJ found credible Claimant’s Expert’s
    statement that “something is flaring up, and we have a suspicion and reasonable
    certainty that . . . [Claimant’s] issues started shortly after his leg injury and have
    never totally resolved . . . .” (Id. (quoting Claimant’s Expert’s Dep. at 21, R.R. at
    191a).) The WCJ acknowledged the seemingly inconsistent nature of Dr. Pugliese’s
    opinions – in his September 8, 2017 letter he stated there is no way to prove causality
    between an infection and the expression of autoimmunity, while in his January 3,
    2018 letter he stated that Claimant’s angioedema was caused by the infection
    resulting from Claimant’s work-related injury. (Id.) The WCJ concluded:
    The challenge by [] [Employer] herein as to the sufficiency of causality
    was correctly argued. While there is, of course, no specific evidence of
    what substance entered [] [C]laimant’s system resultant from having a
    laceration on his left lower leg with a piece of metal at a landfill, this
    Judge thinks [] [C]laimant’s [Expert], . . . and ultimately Dr. Pugliese
    10
    eventually within his January 3, 2018 report[,] gave consideration to
    the same and were still able to unequivocally opine that [C]laimant
    developed severe angioedema that was related to the infection he got at
    work . . . .
    (Id.)
    The WCJ “rejected as not credible” Employer’s Expert’s opinions. (Id. ¶ 27.)
    In particular, the WCJ found Employer’s Expert’s opinion that Claimant’s injury
    was not significant enough to cause an autoimmune response unsupported by the
    record because Employer’s Expert “has nothing to identify or establish the
    precipitating agent or trauma at a landfill that entered [] [C]laimant’s system through
    a piece of metal.” (Id.) The WCJ noted that Employer’s Expert examined Claimant
    on only four occasions over a period of less than two weeks and, though Employer’s
    Expert reviewed Claimant’s medical records prior to his deposition, a full year had
    elapsed since Employer’s Expert saw Claimant, during which time Claimant had
    many treatments. It was disingenuous, according to the WCJ, for Employer’s Expert
    to state, based upon reviewing Claimant’s treatment records between April 3, 2017,
    and his deposition on May 3, 2018, that no one had a “firm grasp on establishing a
    working diagnosis for [] [C]laimant.” (Id. ¶ 28.)
    Based on his credibility determinations and factual findings, the WCJ
    concluded that Claimant had met his burden of proving a causal connection between
    the March 21, 2017 work incident, a laceration that became infected resulting in
    angioedema, which caused his ongoing disability. (WCJ Decision, Conclusion of
    Law ¶ 2.) Therefore, the WCJ granted the Claim Petition. Employer appealed to
    the Board.
    11
    E. Board Opinion
    In its appeal, Employer argued the WCJ’s Decision was not supported by
    substantial evidence and was based on equivocal opinions. Employer maintained in
    its appeal that Claimant’s burden of proof on causation was assumed, shifting the
    burden on Employer to disprove causation. The WCJ also erred, according to
    Employer, by granting Claimant ongoing disability due to the “implied theory” of
    “possible recurrence.” (Employer’s Appeal, R.R. at 50a.)
    The Board affirmed the WCJ’s Decision. The Board held that the WCJ did
    not err by crediting Claimant’s Expert’s opinions over the contrary opinions of
    Employer’s Expert and that Claimant was able to meet his burden of proof based on
    the testimony of Claimant’s Expert and Dr. Pugliese’s 2018 note, which “tied
    Claimant’s development of angioedema to his infection from the work incident.”
    (Board’s Opinion at 3, 5.) According to the Board, “the substantial, competent
    evidence of record supports the fact Claimant sustained a work-related injury that
    resulted in a disability.” (Id. at 6.) Moreover, the Board held that Claimant’s
    Expert’s testimony was not equivocal, and the WCJ did not err in relying upon it
    because, while Employer “ma[de] arguments taking various parts of [Claimant’s
    Expert’s] testimony out of context, review of it as a whole clearly shows [Claimant’s
    Expert’s] unequivocal opinion that Claimant’s angioedema was caused by his work-
    related injury.” (Id. at 7.) Employer now petitions this Court for review.6
    6
    This Court’s “review is limited to determining whether constitutional rights were violated,
    whether the adjudication is in accordance with the law[,] or whether necessary findings of fact are
    supported by substantial evidence.” City of Philadelphia v. Workers’ Comp. Appeal Bd.
    (Sherlock), 
    934 A.2d 156
    , 159 n.5 (Pa. Cmwlth. 2007).
    12
    II. Appeal to this Court
    Employer raises three issues on appeal. Employer contends that the WCJ’s
    finding that Claimant’s laceration became infected is not supported by substantial
    evidence. Employer also argues that Claimant’s Expert’s opinion that the infected
    laceration caused Claimant’s angioedema is equivocal and thus incompetent.
    Employer last maintains that the Board erred by affirming the WCJ’s Decision
    granting ongoing disability benefits under the premise of “possible recurrence.”
    (Employer’s Brief (Br.) at 32.)
    This being a claim petition proceeding, Claimant bears the burden of
    establishing all of the elements necessary to support an award of workers’
    compensation benefits, including the existence of an injury and disability, and a
    causal relationship between the disability and the work incident. Giant Eagle, Inc.
    v. Workers’ Comp. Appeal Bd. (Thomas), 
    725 A.2d 873
    , 876 (Pa. Cmwlth. 1999).
    Disability is the loss of earnings or earning power that is caused by a work-related
    injury. Sch. Dist. of Phila. v. Workers’ Comp. Appeal Bd. (Lanier), 
    727 A.2d 1171
    ,
    1172 (Pa. Cmwlth. 1999). Where the causal relationship between the work incident
    and the injury is not obvious, unequivocal medical evidence is necessary to establish
    that relationship. Roundtree v. Workers’ Comp. Appeal Bd. (City of Philadelphia),
    
    116 A.3d 140
    , 145 (Pa. Cmwlth. 2015) (citations omitted). We now address
    Employer’s arguments as to why Claimant did not meet his burden of proof.
    A. Substantial Evidence
    1. Parties’ Arguments
    Employer argues that the Board improperly credited Claimant’s Expert’s
    opinion that Claimant’s laceration became infected because the opinion relied on
    13
    “insufficient evidence.” (Employer’s Br. at 27.) Employer focuses on the following
    exchange from Claimant’s Expert’s deposition:
    Q.    As a result of your treatment of [Claimant], your understanding
    of his injury, also the review of [Employer’s Expert’s] records,
    and, by the way, the review of th[e] photograph [showing
    Claimant’s laceration],[] do you have an opinion within a
    reasonable degree of medical certainty as to whether or not the
    injury which caused the laceration also resulted in an infection?
    A.    It’s my opinion that that injury did relate, did cause an infection
    to [Claimant].
    (Id. at 23-24 (quoting Claimant’s Expert’s Dep. at 22, R.R. at 192a) (footnote
    omitted).) According to Employer, this exchange illustrates that Claimant’s Expert’s
    opinion was based on: (1) Claimant’s “lay opinion that his leg became infected[;]”
    (2) Claimant’s Expert’s treatment of Claimant; (3) Claimant’s Expert’s review of
    Employer’s Expert’s records; and (4) Claimant’s Expert’s review of a photograph
    showing Claimant’s laceration. (Id. at 22-26.)
    Employer argues that an opinion regarding the presence of an infection may
    only be given by an expert witness, and because Claimant’s Expert relied on
    Claimant’s “lay opinion” as to the issue of infection, the WCJ should not have
    credited Claimant’s Expert’s opinion that Claimant’s leg was infected. (Id. at 22-
    23.) Moreover, Employer submits that, to the extent Claimant’s Expert’s opinion
    was based on his treatment of Claimant, the opinion should not be credited because
    Claimant’s Expert did not treat Claimant until three months after the work-related
    injury, and, by that time, the laceration had healed. (Id. at 24.) And, according to
    Employer, Claimant’s Expert could not have formed his opinion by reviewing
    Employer’s Expert’s records “because those records flatly refute the existence of an
    14
    infection.” (Id.) Further, Claimant’s Expert’s testimony regarding the photograph
    of Claimant’s laceration is unclear:
    Q.      And, Doctor, upon the review of that photograph, does that sort
    of buttress your opinion regarding the severity of the laceration
    and/or infection?
    A.      Yes, it does.
    (Id. at 26 (quoting Claimant’s Expert’s Dep. at 11-12, R.R. at 181a-82a).) According
    to Employer, Claimant’s Expert’s answer was unclear – to which question was his
    answer addressed?
    In summary, Employer claims that the “only evidence upon which the [WCJ]
    credited Claimant’s Expert’s opinion that [Claimant’s] laceration became infected
    was [Claimant’s] self-serving lay opinion that he had an infection and the affirmative
    response of [Claimant’s Expert] to a compound, unclear question.” (Id. at 26-27.)
    That evidence, Employer contends, does not “rise up to the threshold of being
    substantial evidence.” (Id. at 27.)
    Claimant responds that the WCJ’s finding that Claimant’s leg wound became
    infected is supported by substantial evidence. The finding was based on Claimant’s
    Expert’s opinion, and “it was the WCJ’s prerogative to credit [Claimant’s Expert’s]
    opinion over that of [Employer’s Expert’s], which [the WCJ] did.” (Claimant’s Br.
    at 15.) According to Claimant, “a reasonable mind would find this evidence
    ([Claimant’s Expert’s] opinion as to causality and ongoing disability) adequate to
    support the WCJ’s findings and conclusions . . . .” (Id.)7
    7
    Claimant argues that Employer waived its argument that the WCJ did not issue a
    “reasoned decision.” (Claimant’s Br. at 9.) However, nowhere in Employer’s brief is such an
    argument advanced. Accordingly, we need not consider Claimant’s waiver argument. In addition,
    Claimant spends considerable time in his brief defending the WCJ’s credibility determinations.
    However, in its reply brief, Employer is clear that it is not contesting those determinations. “The
    15
    2. Analysis
    In reviewing a substantial evidence8 challenge, we “consider the evidence as
    a whole, view the evidence in the light most favorable to the party [that] prevailed
    before the WCJ, and draw all reasonable inferences which are deducible from the
    evidence in” that party’s favor. Frog, Switch & Mfg. Co. v. Workers’ Comp. Appeal
    Bd. (Johnson), 
    106 A.3d 202
    , 206 (Pa. Cmwlth. 2014) (quotation omitted).
    “[W]here both parties present evidence, it does not matter that there is evidence in
    the record [that] supports a” contrary finding; the only question is whether there is
    evidence that supports the findings that were made. McCabe v. Workers’ Comp.
    Appeal Bd. (Dep’t of Revenue), 
    806 A.2d 512
    , 515 (Pa. Cmwlth. 2002). “The WCJ
    is the ultimate fact finder and has complete authority for making all credibility” and
    evidentiary weight determinations. Rife v. Workers’ Comp. Appeal Bd. (Whitetail
    Ski Co.), 
    812 A.2d 750
    , 755 (Pa. Cmwlth. 2002). It is well-settled that a “WCJ may
    reject the testimony of any witness in whole or in part, even if that testimony is
    uncontradicted.” Hoffmaster v. Workers’ Comp. Appeal Bd. (Senco Prods., Inc.),
    
    721 A.2d 1152
    , 1156 (Pa. Cmwlth. 1998).
    Although Employer argues there is insufficient evidence to support the WCJ’s
    finding that Claimant’s laceration became infected, we disagree. Claimant’s Expert
    opined that Claimant’s laceration became infected based on: (1) Claimant’s report
    about his work-related injury and subsequent infection; (2) Employer’s Expert’s use
    of dual antibiotic therapy to treat Claimant; and (3) a photograph showing
    [WCJ’s] credibility determinations are not a question before this Court, and as a result, should not
    be considered in deciding the instant matter.” (Employer’s Reply Br. at 1.) Accordingly, we need
    not evaluate the WCJ’s credibility determinations.
    8
    “Substantial evidence is such relevant evidence as a reasonable mind might accept as
    adequate to support a conclusion.” City of Philadelphia v. Workers’ Comp. Appeal Bd. (Kriebel),
    
    29 A.3d 762
    , 769 (Pa. 2011).
    16
    Claimant’s laceration. Employer contends that this evidence is either insufficient to
    support that opinion or flatly refutes that opinion and, therefore, the WCJ’s finding
    is unsupported.
    Employer first argues that an opinion regarding the presence of an infection
    may only be given by an expert witness, and because Claimant’s Expert relied on
    Claimant’s “lay opinion” as to the issue of infection, the WCJ should not have
    credited Claimant’s Expert’s opinion that Claimant’s leg was infected. (Employer’s
    Br. at 22-23.) Contrary to Employer’s argument, it was not necessary for Claimant
    to be a medical expert to report to Claimant’s Expert that his work-related laceration
    became infected, and it was not improper for Claimant’s Expert to have relied on
    Claimant’s report in rendering his ultimate opinion. Claimant’s Expert’s medical
    opinion was based on multiple factors, including Claimant’s factual report that he
    had “pus [] flowing out of his leg for a day or two [after the injury], . . . had to be re-
    seen [by Employer’s Expert], and . . . was on antibiotics.” (R.R. at 181a.) From this
    information, which is corroborated by Employer’s Expert’s testimony, Claimant’s
    Expert “gathered [Claimant] had an infection.” (Id.) In addition, Claimant’s
    Expert’s review of a photograph showing Claimant’s laceration approximately two
    weeks after the incident, (id. at 149a), to which no objection was lodged, buttressed
    Claimant’s Expert’s opinion that Claimant’s leg was infected, (id. at 181a-82a.)
    Thus, Employer’s focus on “[Claimant’s] subjective lay opinion of infection” and
    the purported “parameters of th[e] legal standard” applicable thereto, (Employer’s
    Br. at 22), misses the mark because Claimant’s Expert did not base his opinion
    merely on Claimant’s opinion as to whether he had had an infection.
    Moreover, Employer’s argument that “[Claimant’s Expert’s] review of
    [Employer’s Expert’s] records could not be the basis for finding that [Claimant] had
    17
    an infection because those records flatly refute the existence of an infection”
    misconstrues the evidence. (Id. at 24.) While Employer points out language in
    Employer’s Expert’s records tending to suggest an infection was not present, (id. at
    25), there is also language indicating the contrary, including Employer’s Expert’s
    prescribing of Augmentin and Doxycycline Monohydrate, (R.R. at 272a-73a),
    noting that, after Claimant’s second visit on March 23, 2017, there was no
    “significant evidence of an infective process” and no “outward signs of significant
    infection,” (id. at 275a-76a) (emphasis added)), and that, as of April 3, 2017, “the
    infection is resolved and [Claimant] does not require any further treatment,” (id. at
    280a (emphasis added)). Thus, when considered as a whole, Employer’s Expert’s
    records do not “flatly refute the existence of an infection,” (Employer’s Br. at 24),
    but rather are, at most, ambiguous on that issue, and, as the ultimate fact finder, the
    WCJ had “complete authority for making all credibility” and evidentiary weight
    determinations. Rife, 
    812 A.2d at 755
    .
    Further, Employer’s challenge to Claimant’s Expert’s testimony regarding the
    photograph showing Claimant’s laceration is not persuasive. At his deposition,
    Claimant’s Expert was asked to review Claimant’s exhibit 3, the photograph
    Claimant took of the laceration two weeks after the work incident and, having done
    so, testified:
    Q.    And, Doctor, do you know whether or not he had an infectious
    process going on or can you tell that by your exam?
    A.     Subjectively what he had described to me . . . is that he was
    injured at work. He told me that he presented to the work doctor, it was
    cleaned out, and he indicated pus was flowing out of his leg for a day
    or two later. He had to be re-seen, and [] he was on antibiotics. From
    that I gathered he had an infection.
    18
    Q.     And, Doctor, upon review of that photograph, does that sort of
    buttress your opinion regarding the severity of the laceration and/or
    infection?
    A.        Yes, it does.
    Q.    And in review [of Employer’s Expert’s] note, do you have any
    cause to believe that [Claimant] did not have an infection?
    A.     No, I do not. I’m sorry. I do believe he did have an infection
    based on [Employer’s Expert’s] description of the laceration and the
    fact that [Employer’s Expert] started [Claimant] on dual antibiotic
    therapy or Augmentin and Doxycyline.
    (R.R. at 180a-82a.) Employer isolates the part of this exchange wherein Claimant’s
    Expert is asked whether the photograph “buttress[es] [his] opinion regarding the
    severity of the laceration and/or infection,” and Claimant’s Expert answers “[y]es, it
    does.” (Employer’s Br. at 26.) In so doing, Employer argues that Claimant’s Expert
    “did not provide any explanation; he merely gave an affirmative response to an
    unclear compound question . . . .” (Id.) However, when this passage is considered
    in context with the questioning and testimony that occurred before and after it, which
    was concerned solely with whether an infection was present, it was reasonable for
    the WCJ to infer that Claimant’s Expert’s answer addressed the infection portion of
    the question.
    Accordingly, because Claimant’s Expert’s opinion was not based on an
    improper lay opinion and was otherwise supported, the WCJ’s crediting of that
    opinion was not “arbitrary and capricious or so fundamentally dependent on a
    misapprehension of material facts, or so otherwise flawed, as to render it irrational.”
    Casne v. Workers’ Comp. Appeal Bd. (STAT Couriers, Inc.), 
    962 A.2d 14
    , 19 (Pa.
    Cmwlth. 2008).        And, because “a reasonable mind might accept” Claimant’s
    Expert’s opinion “as adequate” to support the finding that Claimant’s laceration
    19
    became infected, the challenged finding of fact is supported by substantial evidence.
    City of Philadelphia v. Workers’ Comp. Appeal Bd. (Kriebel), 
    29 A.3d 762
    , 769 (Pa.
    2011).
    B. Equivocation
    1. Parties’ Arguments
    Employer contends that Claimant has not met his burden of proving a causal
    connection between his disabling injury – angioedema – and his work-related
    laceration because the expert testimony Claimant offered to establish that connection
    is equivocal. Employer posits four reasons why Claimant’s Expert’s testimony is
    equivocal.
    First, in response to the question of whether an infection is an accepted cause
    of angioedema, Claimant’s Expert stated that “[i]t could be one, yes.” (Employer’s
    Br. at 28 (quoting R.R. at 209a).) This testimony, according to Employer, is
    equivocal as a matter of law because “[s]uch [an] expert opinion that it is conceivable
    that a substance could cause or may have caused an effect does not constitute
    unequivocal medical testimony and is not competent evidence to support a finding
    that any such effect occurred.” (Id. (quoting BJ’s Wholesale Club v. Workers’ Comp.
    Appeal Bd. (Pearson), 
    43 A.3d 559
    , 565 (Pa. Cmwlth. 2012) (emphasis in
    original)).)
    Second, Claimant’s Expert relied on the medical opinion of Dr. Pugliese, who
    expressed “absolutely equivocal opinions,” (Employer’s Br. at 30), by opining in
    one note that “there’s no way to prove causality” between an infection and the
    expression of autoimmunity, (id. at 29 (quoting R.R. at 208a-09a)), and, in a second,
    later note, stating that “[Claimant] has developed severe angioedema that is related
    to an infection that he got at work[,]” (id. at 29-30 (quoting R.R. at 212a)). Thus,
    20
    argues Employer, “any opinion provided by Dr. Pugliese that [Claimant’s Expert]
    would have relied upon would have been equivocal as a matter of law.” (Id. at 30.)
    Third, Claimant’s Expert’s opinion regarding causation is equivocal.
    Employer cites Claimant’s Expert testimony as follows:
    Q.   Okay. And at that point in time were you able to come to a
    medical diagnosis regarding what was going on with [Claimant]?
    A.    We have a working diagnosis of angioedema with no causative
    bacteria or etiology . . . .
    (Id. at 30 (quoting Claimant’s Expert’s Dep. at 21, R.R. at 191a) (emphasis in
    original).) Employer argues that “[t]he fact that [Claimant’s Expert] later opines to
    within a reasonable degree of medical certainty that an infection had caused the
    angioedema, totally contradicts [t]his statement.” (Id.)
    Last, Claimant’s Expert’s testimony is equivocal because, Employer argues,
    “it is based on nothing more than the proximity of the injury and onset of
    angioedema.” (Id. at 31.) In support of this assertion, Employer cites the following
    testimony:
    Q.     And, Doctor, based on the history, the medical background as
    you understood [Claimant’s] condition to be prior to March 21, 2017,
    up until today’s date, whether or not there’s a connection between his
    injury, the laceration, infection, and the angioedema?
    A.     I believe there is a connection between the infection and the
    angioedema, as it never was present before, and it surfaced fairly soon
    after his injury.
    (Id. (quoting R.R. at 193a).) Employer contends that “[t]estimony is equivocal when
    the medical expert merely assumes that an injury is work-related based upon
    temporal proximity to a work event.” (Id. at 31-32 (quoting Moyer v. Workers’
    21
    Comp. Appeal Bd. (Pocono Mountain Sch. Dist.), 
    976 A.2d 597
    , 599 (Pa. Cmwlth.
    2009)) (alteration in original).)
    Claimant responds that Claimant’s Expert testified unequivocally that
    Claimant’s work-related laceration became infected and that infection caused
    Claimant’s disabling injury – angioedema. Claimant contends that ample caselaw
    supports this position because Claimant’s Expert testified that it was his
    “professional opinion within a reasonable degree of medical certainty that the work-
    related laceration that Claimant sustained . . . resulted in an infection and, later,
    angioedema . . . .” (Claimant’s Br. at 4.) Acknowledging that Claimant’s Expert
    explained that infection is not the only cause of angioedema, Claimant points out
    that Claimant’s Expert nonetheless “opined within a reasonable degree of medical
    certainty that it was his professional opinion that the angioedema Claimant was
    experiencing was causally related to [his] infection . . . .” (Id. at 6.)
    2. Analysis
    When unequivocal medical evidence is necessary, “the medical witness must
    testify, not that the injury or condition might have or possibly came from the
    assigned cause, but that in [the witness’s] professional opinion the result in question
    did come from the assigned cause.” Berks Cnty. Intermediate Unit v. Workmen’s
    Comp. Appeal Bd. (Rucker), 
    631 A.2d 801
    , 804 (Pa. Cmwlth. 1993). In determining
    whether testimony is equivocal, “we examine the testimony of a witness as a whole
    and do not take words or phrases out of context.” Bemis v. Workers’ Comp. Appeal
    Bd. (Perkiomen Grille Corp.), 
    35 A.3d 69
    , 72 (Pa. Cmwlth. 2011).               Medical
    evidence that is less than positive or is based on possibilities is equivocal and is not
    legally competent evidence that establishes the necessary causal relationship. Potere
    v. Workers’ Comp. Appeal Bd. (Kemcorp), 
    21 A.3d 684
    , 690-91 (Pa. Cmwlth. 2011).
    22
    “However, the law does not require every utterance which escapes the lips of a
    medical witness on a medical subject to be certain, positive, and without reservation
    or exception.” Bemis, 
    35 A.3d at 72
    . A medical opinion is not considered equivocal
    simply because the witness “use[s] [] words such as ‘probably,’ ‘likely,’ and
    ‘somewhat’ . . . so long as the testimony, read in its entirety, is unequivocal and the
    witness does not recant the opinion or belief first expressed.” 
    Id.
     “Whether an
    expert’s opinion is competent is a question of law subject to plenary review.”
    Kriebel, 29 A.3d at 769.
    Applying these principles to Claimant’s Expert’s testimony in its entirety, his
    testimony that Claimant’s work-related laceration became infected and that this
    infection caused Claimant’s angioedema is unequivocal and, therefore, competent to
    support the WCJ’s findings. On direct examination, Claimant’s Expert testified as
    follows:
    Q.     As a result of your treatment of [Claimant], your understanding
    of his injury, also the review of [Employer’s Expert’s] records, and, by
    the way, the review of that photograph [showing the laceration], do you
    have an opinion within a reasonable degree of medical certainty as to
    whether or not the injury which caused the laceration also resulted in
    an infection?
    A.     It’s my opinion that that injury did relate, did cause an infection
    to [Claimant].
    Q.     And, Doctor, the next opinion based on your treatment and
    treatment of referral physicians within your medical group, and your
    occasion to review their opinions, and also your occasion to continue
    to treat [Claimant], do you have an opinion within a reasonable degree
    of medical certainty as to, number one, the diagnosis, which I believe
    you already stated, but you can state it again.
    A.     Angioedema.
    23
    Q.     And, Doctor, based on the history, the medical background as
    you understood [Claimant’s] condition to be prior to March 21, 2017,
    up until today’s date, whether or not there’s a connection between his
    injury, the laceration, infection, and the angioedema?
    A.     I believe there is a connection between the infection and the
    angioedema, as it never was present before, and it surfaced fairly soon
    after his injury.
    Q.     Is that opinion based within a reasonable degree of medical
    certainty?
    A.     Yes, it is.
    (R.R. at 192a-93a.) This exchange is a clear expression of “[Claimant’s Expert’s]
    professional opinion [that] the result in question[, angioedema,] did come from the
    assigned cause,” Berks County Intermediate Unit, 
    631 A.2d at 804
    , and it is
    sufficient to establish a causal relationship between the injury and the work incident,
    Giant Eagle, Inc., 
    725 A.2d at 876
    . See also Phila. Coll. of Osteopathic Med. v.
    Workmen’s Comp. Appeal Bd. (Lucas), 
    465 A.2d 132
    , 135 (Pa. Cmwlth. 1983)
    (“[A]s to the facts which a claimant must prove by medical evidence, it is sufficient
    that [the claimant’s] medical expert, after providing a foundation, testify that in [the
    expert’s] professional opinion or that [the expert] believes or that [the expert] thinks
    the facts exist.”).
    Employer’s arguments would have us enforce an equivocality standard that
    permits no room for expressions of doubt, but that is not the law. “[T]he law does
    not require every utterance which escapes the lips of a medical witness on a medical
    subject to be certain, positive, and without reservation or exception.” Bemis, 
    35 A.3d at 72
    ; see also Phila. Coll. of Osteopathic Med., 465 A.2d at 134-35 (“Certainly
    it is not the law . . . that every utterance which escapes the lips of a medical witness
    on a medical subject, must be certain, positive, and without reservation, exception,
    24
    or peradventure of a doubt.”). Thus, a medical opinion is not considered equivocal
    simply because the witness uses words such as “probably,” “likely,” and
    “somewhat,” “so long as the testimony, read in its entirety, is unequivocal and the
    witness does not recant the opinion or belief first expressed.” Bemis, 
    35 A.3d at 72
    .
    For this reason, we reject Employer’s argument, relying on BJ’s Wholesale
    Club, that Claimant’s Expert’s statement that an infection “could be” a cause of
    angioedema rendered Claimant’s Expert’s entire opinion “equivocal as a matter of
    law, even if [Claimant’s Expert] had earlier said the ‘magic words’[] that the
    infection led to [Claimant’s] development of angioedema.” (Employer’s Br. at 28
    (footnote omitted).) In BJ’s Wholesale Club, we held that an expert’s testimony was
    equivocal because it was based entirely on possibilities – the expert’s testimony
    regarding causation was replete with words such as “can,” “conceivable,” and
    “could.” 
    43 A.3d at 565-66
    . Here, in contrast, Claimant’s Expert’s testimony, read
    in its entirety, is positive on the issues of whether Claimant’s laceration caused an
    infection which in turn led to him developing angioedema, and Claimant’s Expert’s
    single expression of mere possibility is insufficient to render his entire opinion
    equivocal.
    Furthermore, Claimant’s Expert’s medical opinion is not equivocal simply
    because he considered the medical opinions of other physicians whose opinions were
    arguably inconsistent or differed from his. Employer contends that Dr. Pugliese,
    whose opinions Claimant’s Expert relied upon, expressed “absolutely equivocal
    opinions,” (Employer’s Br. at 30), as illustrated in Dr. Pugliese’s notes dated
    September 18, 2017, and January 3, 2018. However, the seemingly contradictory9
    9
    It is unclear from the record if something changed Dr. Pugliese’s opinion in the months
    between September 2017 and January 2018, particularly given the number of specialists Claimant
    had been seeing.
    25
    nature of Dr. Pugliese’s opinions has no bearing on the equivocality of Claimant’s
    Expert’s own testimony regarding causation. Claimant’s Expert did not testify that
    he shared the exact same views as Dr. Pugliese along the same timeline that Dr.
    Pugliese held them. Instead, Claimant’s Expert testified that, within a reasonable
    degree of medical certainty, “there is a connection between the infection and the
    angioedema,” (R.R. at 193a), and other causes – hereditary, cold air induced causes,
    insect borne, and medication – had been ruled out.
    Finally, Employer points out Claimant’s Expert’s own “equivocal” deposition
    testimony, which Employer cites in the following manner:
    Q.   Okay. And at that point in time were you able to come to a
    medical diagnosis regarding what was going on with [Claimant]?
    A.    We have a working diagnosis of angioedema with no causative
    bacteria or etiology . . . .
    (Employer’s Br. at 30 (quoting R.R. at 191a) (emphasis in original).) Employer
    argues that “[t]he fact that [Claimant’s Expert] later opines [] within a reasonable
    degree of medical certainty that an infection had caused the angioedema, totally
    contradicts his statement.” (Id.) Employer doubles down in its reply brief, arguing
    that these “two statements sat next to each other are jaw-droppingly contradictory
    and undoubt[edly] 100% equivocal as a matter of law.” (Employer’s Reply Br. at
    2.)   However, Employer fails to cite the full deposition testimony, in which
    Claimant’s Expert expressed his opinion that Claimant has angioedema “with no
    causative bacteria or etiology, apparently, according to the immunologist.” (R.R.
    at 191a (emphasis added).) In addition, immediately after this answer, Claimant’s
    Expert testified:
    26
    Something is flaring it up, and we have a suspicion and a reasonable
    certainty that, from the timeline that I have been taking care of
    [Claimant], I believe his issues started shortly after his leg injury, and
    have never totally resolved, and have flared-up off and on since that
    time.
    (Id.) Read in its entirety, this portion of the deposition testimony does not reveal, as
    Employer submits, Claimant’s Expert’s opinion that Claimant’s angioedema was not
    caused by a bacterial infection. (See Employer’s Reply Br. at 2.) Instead, it shows
    Claimant’s Expert’s understanding of the immunologist’s opinion and Claimant’s
    Expert’s “reasonable certainty” that Claimant’s autoimmune issues began shortly
    after his injury. Whether or not the immunologist believed that a bacterial infection
    was the cause of Claimant’s angioedema has no bearing on the equivocality of
    Claimant’s Expert’s own testimony regarding causation.
    We also reject Employer’s argument, relying on Moyer, that Claimant’s
    Expert’s opinion is equivocal because “it is based on nothing more than the
    proximity of the injury and onset of angioedema.” (Employer’s Br. at 31.) This
    Court in Moyer stated that “[t]estimony is equivocal when the medical expert merely
    assumes that an injury is work-related based on temporal proximity to a work
    event.” Moyer, 
    976 A.2d at 599
     (emphasis added). However, Claimant’s Expert did
    not merely assume on the basis of timing that Claimant’s work-related injury caused
    the angioedema. Again, it is important to read Claimant’s Expert’s testimony in
    context. Directly preceding the exchange that Employer relies on is the following:
    Q.     As a result of your treatment of [Claimant], your understanding
    of his injury, also the review of [Employer’s Expert’s] records, and, by
    the way, the review of that photograph [showing the laceration], do you
    have an opinion within a reasonable degree of medical certainty as to
    whether or not the injury which caused the laceration also resulted in
    an infection?
    27
    A.     It’s my opinion that that injury did relate, did cause an infection
    to [Claimant].
    Q.     And, Doctor, the next opinion based on your treatment and
    treatment of referral physicians within your medical group, and your
    occasion to review their opinions, and also your occasion to continue
    to treat [Claimant], do you have an opinion within a reasonable degree
    of medical certainty as to, number one, the diagnosis, which I believe
    you already stated, but you can state it again.
    A.      Angioedema.
    (R.R. at 192a-93a.) When this line of questioning is read together with the portions
    Employer isolated, it is clear that Claimant’s Expert concluded that Claimant’s
    infected laceration caused his angioedema based on Claimant’s Expert’s history of
    treating Claimant, his review of Employer’s Expert’s records, a review of a
    photograph showing the laceration, his review of the opinions of physicians to which
    Claimant was referred, and the timing of the injury and onset of the angioedema.
    Accordingly, because viewing Claimant’s Expert’s testimony in its entirety
    reveals that his opinions were not based on mere possibilities, the equivocal opinions
    of other physicians, or the mere temporal proximity between the work incident and
    Claimant developing angioedema, that testimony was not equivocal. Therefore,
    Claimant’s Expert’s opinion that, within a reasonable degree of medical certainty,
    Claimant’s leg became infected which, in turn, caused Claimant to develop
    angioedema, is competent testimony on the issue of causation.
    C. WCJ’s Grant of Ongoing Disability Benefits
    1. Parties’ Arguments
    Employer last contends that the Board erred by affirming the WCJ’s Decision
    granting Claimant ongoing disability benefits under the premise of a “possible
    recurrence.” (Employer’s Br. at 32.) Employer explains that Claimant’s testimony
    28
    shows that Claimant’s alleged disability comes and goes and therefore Claimant is
    not totally disabled. Employer claims it was error for the WCJ to award total
    disability to Claimant because “the mere ‘possibility of a future recurrence [of a
    condition] does not constitute a compensable disability.’” (Id. (quoting Swartz v.
    Workmen’s Comp. Appeal Bd. (Dutch Pantry Rest.), 
    543 A.2d 201
    , 204 (Pa.
    Cmwlth. 1988)) (alteration in original).)
    Claimant responds that the WCJ credited Claimant’s and Claimant’s Expert’s
    testimony regarding Claimant’s ongoing symptoms and the effect those symptoms
    had on Claimant’s ability to work, no objections were lodged regarding that
    testimony, and Employer’s Expert had no firsthand knowledge of Claimant’s
    condition after April 3, 2017. (Claimant’s Br. at 16-17.) According to Claimant,
    because the WCJ’s credibility determinations and findings “were based upon the
    substantial, competent evidence of record, the Board did not err in affirming the
    WCJ’s decision to grant Claimant’s Claim Petition and ongoing total disability
    benefits.” (Id. at 17.)
    2. Analysis
    Claimants may be considered disabled by a work-related injury despite the
    resolution of their symptoms “if there is evidence that [the symptoms] are likely to
    recur once [they] return[] to work.” Schrader Bellows Pneumatics, Div. of Parker-
    Hannifin Corp. v. Workers’ Comp. Appeal Bd. (Earle), 
    711 A.2d 578
    , 581 (Pa.
    Cmwlth. 1998). Where claimants “establish that they [are] unfit or unable to perform
    their duties when they return[ ] to work” by unequivocal medical testimony, ongoing
    disability can be established.   
    Id.
       However, the mere possibility of a future
    recurrence is not a compensable injury. Swartz, 
    543 A.2d at 204
    . In Swartz, the
    claimant argued that she had not recovered from her work-related injury because it
    29
    could possibly recur in the future. 
    Id.
     The claimant’s medical expert testified that
    the claimant had recovered from her disabling injury, which was caused by exposure
    to a chemical solution, but opined that “future exposure to [the] allergic chemicals
    could precipitate further exacerbation” of her condition. 
    Id.
     The Court rejected the
    claimant’s argument and held that “[t]he possibility of a future recurrence does not
    constitute a compensable disability.” 
    Id.
    Based on the WCJ’s findings and credibility determinations, we agree with
    Claimant that there was no error in granting ongoing benefits. The WCJ “accepted
    as most credible and convincing the testimony of [C]laimant . . . as well as
    [Claimant’s Expert].” (FOF ¶ 27.) In response to the question of whether Claimant
    is “disabled for driving tractor-trailer,” Claimant’s Expert’s responded:
    I would consider him disabled, because when he has these flare-ups,
    they are potentially life-threatening, as the tongue can swell, he can get
    short of breath, his hands can swell substantially to the point where it
    does inhibit safe control of steering wheels and reactions times and
    things like that, in my opinion.
    (R.R. at 194a.) Given this testimony, the WCJ found Claimant disabled “from
    returning to work driving a tractor trailer beginning August 31, 2017[,] and
    continuing thereafter.” (FOF ¶ 27.) Here, in contrast to the situation in Swartz, the
    WCJ did not find that Claimant had recovered from his angioedema and merely
    could, upon some triggering event, experience future symptoms. Rather, the WCJ
    found that Claimant’s symptoms are ongoing and interfere with his ability to drive,
    and sometimes they are severe enough to be life-threatening. For this reason,
    Employer’s reliance on Swartz is misplaced.
    30
    III.   Conclusion
    For the foregoing reasons, Claimant satisfied his burden of proving that he
    sustained a compensable work injury which has resulted in ongoing disability, and,
    therefore, there was no error in the Board upholding the WCJ’s Decision granting
    the Claim Petition. Accordingly, we affirm.
    _____________________________________
    RENÉE COHN JUBELIRER, Judge
    31
    IN THE COMMONWEALTH COURT OF PENNSYLVANIA
    Solid Waste Services, Inc., d/b/a        :
    J.P. Mascaro & Sons,                     :
    Petitioner      :
    :
    v.                    :   No. 441 C.D. 2020
    :
    Workers’ Compensation Appeal             :
    Board (Boos),                            :
    Respondent         :
    ORDER
    NOW, March 31, 2021, the Order of the Workers’ Compensation Appeal
    Board, entered in the above-captioned matter, is AFFIRMED.
    _____________________________________
    RENÉE COHN JUBELIRER, Judge