Stillwell v. Secretary of Health and Human Services , 118 Fed. Cl. 47 ( 2014 )


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  • United States Court of Federal Claims
    No. 11-77 V
    (Filed Under Seal: August 21, 2014)
    (Reissued: September 5, 2014)
    _________________________________________
    SHERRIL K. STILLWELL,
    Vaccine Act; Vaccine Injury;
    Petitioner,                  Motion for Review; ADEM;
    Diagnosis; Influenza; Flu
    Vaccination; Preponderance of
    v.                                                                       Evidence
    SECRETARY OF HEALTH
    AND HUMAN SERVICES,
    Respondent.
    _________________________________________
    Sol P. Ajalat, Esq., Ajalat & Ajalat, North Hollywood, CA, for petitioner.
    Alexis B Babcock, Esq., United States Department of Justice, Vaccine/Torts Branch, Civil
    Division, Washington, DC, for respondent.
    OPINION
    Block, Judge.
    This case is before the court on a motion to review (“Pet’r’s Mot.”) then Chief Special
    Master (“CSM”) Campbell-Smith’s decision to dismiss petitioner’s claim for compensation
    under the National Vaccine Injury Compensation Program (the “Vaccine Program” or “Vaccine
    Act”), 42 U.S.C. § 300aa-1 to -34, which provides compensation to individuals who can
    establish, by a preponderance of the evidence, that they have suffered “a vaccine-related injury.”
    § 300aa-11(c)(1)(C). Petitioner, Sherril K. Stillwell, alleges that she developed acute
    demyelinating encephalomyelitis (“ADEM”) as a result of an influenza (“flu”) vaccine she
    received on February 22, 2008.1 Pet. at 1. After holding an evidentiary hearing on the matter,
    the CSM concluded, on June 17, 2013, that petitioner had failed to prove by a preponderance of
    the evidence that she was suffering from ADEM, and denied compensation. Stillwell v. Sec'y of
    Health & Human Servs., (“Stillwell I”) 
    2013 WL 4540013
    (Sp. Mstr. Fed. Cl. June 17, 2013).
    
    This opinion originally was issued under seal on August 21, 2014. The court afforded the
    parties an opportunity to propose redactions in the opinion prior to its reissue. No such
    redactions were proffered. Accordingly, herewith is the reissued opinion without redactions.
    1
    In her petition, petitioner alleged that she suffered from “encephalomyelitis,” a general term for
    inflammation of the brain and spinal cord, which includes a wide range of disorders. Dorland's
    Illustrated Medical Dictionary 608 (31st ed. 2007). Subsequently, however, petitioner’s expert
    witness, Dr. Marcel Kinsbourne, alleged that petitioner was suffering from acute demyelinating
    encephalomyelitis or ADEM. See Pet’r’s Ex. 8 at 3, ECF No. 11.
    Petitioner contends the CSM erred on two fronts. Pet’r’s Mot. at 4-13. First, petitioner
    argues that the CSM applied an incorrect legal standard. Pet’r’s Mot. at 4-5. In petitioner’s
    view, the CSM mistakenly applied the standard for determining whether petitioner suffered an
    actual injury, set forth in Broekelschen v. Sec’y of Health and Human Servs., 
    618 F.3d 1339
    (Fed. Cir. 2010) and Lombardi v. Sec’y of Health and Human Servs., 
    656 F.3d 1343
    , 1352 (Fed.
    Cir. 2011), instead of the three-prong test for causation-in-fact established in Althen v Sec’y of
    Health and Human Servs., 
    418 F.3d 1274
    (Fed Cir. 2005). 
    Id. Second, petitioner
    argues that the
    CSM’s determination that petitioner was not suffering from ADEM and findings in support
    thereof were arbitrary and capricious. Pet’r’s Mot. at 5-13.
    For the reasons explained below, the court disagrees and concludes both that the CSM
    correctly applied the Lombardi standard and that the CSM’s finding that petitioner did not suffer
    from ADEM was not arbitrary or capricious. Accordingly, the court will affirm the CSM’s
    decision.
    I. BACKGROUND
    A. Petitioner’s Recent Medical History
    On February 22, 2008, petitioner received an influenza vaccination. Pet’r’s Ex. 2 at 2. In
    the months following her vaccination, petitioner experienced a series of physical ailments,
    including vertigo, nausea, dizziness, fatigue, numbness, and others. Pet’r’s Ex. 2, 3, 4, 7.
    Because physicians could not ascertain the cause of these symptoms, petitioner sought the
    opinions of practitioners from several fields of medicine. 
    Id. On April
    28, petitioner visited Chierry Anderson Poyotte, a doctor of internal medicine,
    and reported that she was suffering from right ear pain, weakness, and low energy, as well as
    vertigo and nausea. Pet’r’s Ex. 4 at 161. Dr. Poyotte diagnosed petitioner with “otitis media,”
    commonly known as an inner ear infection, and vertigo. 
    Id. at 163.
    On April 30, petitioner
    returned to Dr. Poyotte, and stated that she continued to experience malaise and fatigue but Dr.
    Poyotte did not make any further diagnosis. 
    Id. at 154.
           Petitioner then sought a second opinion from Natalie Ting, a doctor of osteopathic
    medicine, on May 6. 
    Id. at 147.
    Petitioner described her symptoms as earache, fatigue, and
    dizziness. 
    Id. She also
    stated that she had been experiencing numbness along the right side of
    her body for the past three weeks. 
    Id. Dr. Ting
    did not offer a diagnosis but noted that, in her
    opinion, petitioner’s exam results were not consistent with the described symptoms. 
    Id. at 149.
            On May 9, petitioner visited a second doctor of internal medicine, Kijung Paul Sung,
    reporting many of the same symptoms that she had reported to previous doctors, including
    vertigo, dizziness, fatigue, and numbness along the right side of her body. 
    Id. at 139-140.
    Dr.
    Sung recommended, and petitioner underwent, a computer tomography (“CT”) scan and
    magnetic resonance imaging (“MRI”) of petitioner’s brain, both of which produced
    “unremarkable,” or normal, results. 
    Id. at 142-3.2
    2
    Magnetic Resonance Imaging is “a method of visualizing soft tissues of the body by applying
    an external magnetic field that makes it possible to distinguish between hydrogen atoms in
    - 2 -
    On May 27, petitioner checked-in to an emergency room after experiencing vertigo,
    anomalous tastings, numbness and weakness on her right side, and difficulty speaking and
    coordinating muscle movements. Pet’r’s Ex. 4 at 128. Attending physicians conducted an MRI
    of petitioner’s brain and cervical spine. 
    Id. at 127.
    Neither test revealed a notable physical
    abnormality and physicians noted that the cause of her symptoms was “unclear” at that time. 
    Id. at 128.
            Petitioner next sought out a neurologist, David Shaw, on June 9, complaining of unsteady
    gait, blurred vision, generalized weakness, and intermittent neck pain, in addition to her previous
    symptoms. 
    Id. at 114.
    Dr. Shaw suspected petitioner was afflicted with multiple sclerosis
    (“MS”)3 and ordered a visual evoked response test to confirm his diagnoses. 
    Id. at 115.
    But, Dr.
    Shaw noted the lack of lesions or other “obvious evidence” of MS on petitioner’s MRI. On June
    10, petitioner underwent an electroencephalogram (“EEG”) test and visual evoked response test,
    receiving normal results. 
    Id. 111, 120.4
            Also on June 10, petitioner visited a second neurologist, William Miller, and relayed
    similar, but “progressively worsen[ing],” symptoms. Pet’r’s Ex. 3 at 155. During this visit,
    petitioner mentioned, for the first time, that for “several weeks” prior to the onset of her initial
    different environments.” Dorland's at 916. Medical professionals use magnetic resonance
    imaging to observe lesions in the brain of patients that are suspected to have demyelinating
    diseases such as MS and ADEM.
    Computer Tomography (also known as “CT scans” or “CAT scans”) “combines a series of X-ray
    views taken from many different angles and computer processing to create cross-sectional
    images of the bones and soft tissues inside [the] body.” See Mayo Clinic definition, available at
    http://www.mayoclinic.org/tests-procedures/ct-scan/basics/definition/prc-20014610.
    3
    Multiple sclerosis is a disorder of the central nervous system that produces clinical symptoms
    such as “weakness, incoordination, paresthesia, speech disturbances, and visual complaints.”
    Dorland's at 1706. It is characterized by “[centers] of demyelination throughout the white matter
    of the central nervous system, sometimes extending into the gray matter.” 
    Id. Demyelination, in
    turn, is a medical term for deterioration or damage to the protective coating
    (i.e., the “myelin sheath”) that surrounds the nerve fibers in the body’s brain and spinal cord.
    Dorland's at 493. There are three variants of inflammatory demyelination diseases: MS, acute-
    disseminated encephalomyelitis (“ADEM”), and acute hemorrhagic leukoencephalitis. 
    Id. 4 An
    electroencephalogram test (“EEG”) is “a recording of the potentials of the skull generated
    by currents emanating spontaneously from nerve cells to the brain. The normal dominant
    frequency of these potentials is about 8 to 10 cycles per second and the amplitude about 10 to
    100 microvolts. Fluctuations in potential are seen in the form of waves, which correlate well with
    neurologic conditions and so are used in diagnostic criteria.” Dorland’s at 607.
    A visual evoked response test, also known as a visual evoked potential study, measures “changes
    in the evoked cortical potential when the eye is stimulated by light.” Dorland’s at 1496. Stated
    otherwise, the test uses electrodes to measure the time it takes for nerves to respond to optical
    stimulation.
    - 3 -
    symptoms, she had experienced a sensation that her “socks seemed too tight” against her legs.
    
    Id. Dr. Miller
    considered several diagnoses, including MS, but was puzzled by the lack of a
    lesion on petitioner’s MRI to explain the symptoms and noted that it was “hard to localize [a]
    lesion that would explain all of her symptoms.” 
    Id. at 158.
           On July 17, a test of petitioner’s cerebrospinal fluid displayed indicia of MS. Pet’r’s Ex.
    7 at 14-15. On August 2, 2008, an MRI revealed an “unusual lesion” providing evidence of a
    demyelinating disease. Pet’r’s Ex. 3 at 123.
    On August 20, petitioner met with a third neurologist, Christopher Di Stasio. Pet’r’s Ex.
    4 at 68-72. During her appointment, petitioner conveyed that, while her vertigo and numbness
    were improving, other symptoms remained constant. 
    Id. at 73.
    Dr. Di Stasio noted that
    petitioner was “starting to slowly improve.” 
    Id. at 71.
           On September 8, petitioner returned to Dr. Miller, who diagnosed her with a
    demyelinating disease that he believed was “improving slowly.” Pet’r’s Ex. 3 at 102. On March
    20, 2010, petitioner underwent another brain MRI. 
    Id. at 61.
    The results demonstrated
    improvement and reinforced Dr. Miller’s diagnosis of a probable “monophasic demyelinating
    event.” Pet’r’s Ex. 7 at 7. This diagnosis was confirmed on July 30, 2010, when Dr. Sung
    diagnosed petitioner with a demyelinating disease and fibromyalgia. 
    Id. at 25.
    After visiting
    more than six different physicians, petitioner was finally diagnosed with a demyelinating disease.
    B. Proceedings Before the Chief Special Master
    On February 7, 2011, petitioner filed a request for compensation under the Vaccine
    Program, 42 U.S.C. §§ 300aa–1 to –34, which allows petitioners to seek compensation if they
    have “sustained, or ha[ve] significantly aggravated” any “vaccine-related” “illness, disability,
    injury, or condition.” § 300a-11(c)(1)(C). The parties, however, disagree about the nature of
    petitioner’s injury, and whether petitioner’s alleged injury can be caused by flu vaccination.
    Petitioner and respondent each proffered expert reports on this issue.
    1. Petitioner’s Expert
    Petitioner filed the report of Dr. Marcel Kinsbourne, a neurologist and author of many
    medical books, articles, and other medical-related literature. Pet’r’s Ex. 8. Dr. Kinsbourne’s
    opinion, petitioner suffered from “a variant of ADEM” distinguished by its “subacute,” or
    delayed, onset. Pet’r’s Ex. 8 at 6. Dr. Kinsbourne stated that ADEM typically manifests within
    “a few days or weeks.” 
    Id. Dr. Kinsbourne
    believed this was consistent with petitioner’s
    condition, which set in “[a]pproximately four weeks” following petitioner’s vaccination in the
    third week of March of 2008 and “progressed for several months before it stabilized.” 
    Id. at 5;
    see also Tr. at 9, 25. In the evidentiary hearing, Dr. Kinsbourne averred that it is possible for
    ADEM to set in subacutely, taking up to 42 days to surface. Tr. 34. In support of this assertion,
    Dr. Kinsbourne cited a 1994 Institute of Medicine report, which stated that the latency for
    ADEM can be between “5 days to 6 weeks,” as well as two other documents,5 referred to as the
    Singh and Leake articles. Tr. 34; Pet’r’s Ex. 8-6 at 503.
    5
    Pet’r’s Ex. 8-6 at 503, Surendra Singh et al., Acute Disseminated Encephalomyelitis: MR
    Imaging Features, 173 AJR 1101 (1999); Pet’r’s Ex. 8-4 at 387, John A.D. Leake et al., Acute
    - 4 -
    Dr. Kinsbourne also relied on an article referred to by the parties as the “Sejvar” article.6
    Tr. 30, 50-55, 156. The Sejvar article establishes criteria for various levels of “diagnostic
    certainty” in identifying ADEM. 
    Id. Among others,
    the Sejvar article cited (1) single brain
    lesion, (2) trouble finding words, (3) cranial nerve abnormalities, (4) motor weakness, (5)
    sensory abnormalities, (6) ataxia (uncoordinated movement) and gait dysfunction, and (7) arm
    tremors as indicia of ADEM. 
    Id. at 5776-79.
    Dr. Kinsbourne averred that petitioner suffered
    from five of these symptoms: “decreased arousability, aphasia [or language comprehension
    difficulty], motor weakness, sensory abnormalities, and ataxia.” Pet’r’s Ex. 9 at 1-2. Notably,
    the Sejvar article states that an ADEM diagnosis must include discovery of diffuse or multi-focal
    white matter lesions. Tr 75-76. Dr. Kinsbourne stated that petitioner’s MRI results were
    consistent with a diffused white matter lesion and, thus, with ADEM. 
    Id. at 76.
          Dr. Kinsbourne also attested to the causal connection between the flu vaccine and
    ADEM, calling the link “rare” but “well recognized.” Pet’r’s Ex. 8 at 7-9 (citing Hiroshi Shoji &
    Mashahide Kaji, The Influenza Vaccination and Neurological Complications, 42:2 THE
    JAPANESE SOC’Y OF INTERNAL MED. 1 (2003)). He discounted a 2011 study by the Institute of
    Medicine that determined there was insufficient evidence to establish a causal relationship
    between the flu vaccine and ADEM. Tr. 78.
    2. Respondent’s Expert
    Respondent presented the report of Dr. Jeffrey Allen Cohen, a clinical neurologist,
    professor of neurology at Dartmouth medical school, and chief neurologist at Dartmouth
    Hitchcock Medical Center. Resp’t’s Ex. A; see also Tr. 102. Dr. Cohen averred that petitioner
    did not suffer from ADEM. Resp’t’s Ex. A at 1. In his opinion, petitioner’s “clinical picture was
    not consistent with [that] diagnosis.” 
    Id. at 6.
    Dr. Cohen also stated that the duration of
    petitioner’s symptoms was “very atypical for ADEM—[a disease which generally] progresses
    over weeks, not months.” Resp’t’s Ex. A at 2. In Dr. Cohen’s view, onset of ADEM, is almost
    always acute and even a subacute onset of more than four weeks is “very unusual.” 
    Id. at 5;
    see
    also Tr. 141-42. Dr. Cohen testified that in his clinical experience, the outer range for onset of
    ADEM symptoms is four weeks after the vaccination or infection. Tr. 155-56.
    Dr. Cohen further noted that ADEM is a disease “that is severe and swift in its onset,
    reaches a nadir, and then . . . gets better . . . to a great degree.” Tr. 178. Dr. Cohen stated that
    the majority of ADEM patients’ symptoms “tend[] to resolve over a period of . . . two, three, or
    four months.” Tr. 119. In Dr. Cohen’s opinion, petitioner’s condition was not consistent with
    this timetable because her physicians’ treatment choices indicated they believed that “she was
    getting worse.” Tr. 117.
    Dr. Cohen also commented that although there is no “specific marker” for ADEM, it
    would be “very unusual” for a patient not to exhibit diffused or multifocal white matter lesions.
    Disseminated Encephalomyelitis in Childhood: Epidemiologic, Clincal and Laboratory
    Features, 23:8 PEDIATRIC INFECTIOUS DISEASE J. 756 (2004).
    6
    Pet’r’s Ex. 9-1, James J. Sejvar et al., Encephalitis, myelitis, and acute disseminated
    encephalomyelitis (ADEM): Case definitions and guidelines for collection, analysis, and
    presentation of immunization safety data, 25 VACCINE 5771 (2007).
    - 5 -
    Tr. 107-108. Dr. Cohen did not observe any evidence of white matter lesions on either of
    petitioner’s MRI exams taken in May of 2008. Tr. 114. He also stated that there was no record
    of petitioner suffering from facial weakness, a common and readily noted ADEM indicator. Tr.
    113-14. Further, Dr. Cohen believed that the lack of a “markedly depressed level of
    consciousness” indicated petitioner did not suffer from ADEM. Resp’t’s Ex. C at 1.
    Additionally, Dr. Cohen contended that petitioner’s medical history did not support an
    ADEM diagnosis because petitioner’s symptoms were not “diagnosis-specific neurologic
    findings.” 
    Id. Dr. Cohen
    observed that symptoms such as decreased arousability, aphasia, motor
    weakness, sensory abnormalities, and ataxia can indicate conditions such as stroke, traumatic
    brain injury, or MS. 
    Id. He also
    stated that the location of petitioner’s demyelination, on her
    brain stem, “is not the usual location for ADEM” and the area of demyelination was not “as
    extensive” as Dr. Cohen would expect in an ADEM case. Resp’t’s Ex. A at 2. Dr. Cohen also
    argued that “ADEM is a disease [that appears] almost exclusively . . . in children and
    adolescents” and noted that petitioner was in her 50’s at the time of vaccination. 
    Id. at 3.
            Dr. Cohen critiqued Dr. Kinsbourne’s statements, arguing that Dr. Kinsbourne cited to
    medical articles that were not applicable to petitioner’s clinical picture. 
    Id. at 3;
    Resp’t’s Ex. C
    at 1. In Dr. Cohen’s opinion, medical literature does not present “reliable evidence” that the flu
    vaccine can cause ADEM. Tr. 169-70.
    C. The Chief Special Master’s Decision
    On June 17, 2013, the CSM issued a decision denying compensation under the Vaccine
    Act. The CSM considered the evidence in the record, including Dr. Kinsbourne and Dr. Cohen’s
    reports and testimony, and disagreed with Dr. Kinsbourne’s assertion that petitioner’s condition
    was an “atypical ADEM variant.” Stillwell I at 16. Rather, the CSM found that the following six
    factors “weigh against a finding that petitioner has ADEM.” 
    Id. First, the
    CSM found that “although it is not dispositive,” the statistics presented by both
    experts on the typical age of patients who develop ADEM warranted consideration. 
    Id. at 16-17.
    The CSM noted that Dr. Kinsbourne and Dr. Cohen agreed that ADEM “primarily afflicts
    children and adolescents.” 
    Id. at 16-17
    (citing Tr. 29, 38). Cases of ADEM in adults are less
    common but have been reported “in young and elderly adults.” 
    Id. at 16-17.
    Petitioner, 53 at the
    time of vaccination, does not qualify for either of these groups. The CSM considered the
    statistical unlikelihood that petitioner suffered from an adult, middle-aged case of ADEM.
    Second, the CSM observed that none of the petitioner’s numerous physicians diagnosed
    her with ADEM. 
    Id. at 17.
    The CSM noted that petitioner’s treating physicians speculated her
    condition might be due to MS before eventually diagnosing her with a general demyelinating
    brain disorder. 
    Id. The CSM
    found that, contrary to Dr. Kinsbourne’s assertions, the treatment
    prescribed to petitioner by her physicians was not consistent with ADEM. 
    Id. The nature
    of petitioner’s brain lesion formed the third basis for the CSM’s findings. 
    Id. at 18-20.
    It is uncontroverted that petitioner suffered from a brain lesion. 
    Id. But, the
    parties’
    experts disagree on whether petitioner’s lesion was diffuse or multifocal, the latter being a
    necessary condition for ADEM. 
    Id. Dr. Kinsbourne
    contended that petitioner’s solitary
    brainstem lesion was both single and “diffused,” and was consistent with “classical descriptions
    of ADEM” lesions. 
    Id. (quoting from
    Tr. 22). Dr. Cohen argued that a solitary brainstem lesion
    - 6 -
    was atypical, and cited articles describing lesions in ADEM patients as “typically reveal[ing]
    multifocal, bilateral, often large white matter lesions.” 
    Id. (quoting Resp’t’s
    Ex. A-9 at 2). The
    CSM concluded that “[w]hether petitioner’s brain lesion bore the appearance of the type of
    lesion usually seen in ADEM subjects is not clear from the record.” 
    Id. at 20.
    The parties’
    experts could not interpret petitioner’s test results because the images were not available. 
    Id. Consequently, the
    CSM determined that Dr. Kinsbourne’s contention that petitioner’s lesion
    “was sufficiently diffuse” to demonstrate ADEM was not persuasive because “petitioner’s own
    treating physicians,” who were able to review the image results, “were not persuaded.” 
    Id. Fourth, the
    CSM found that the timing of petitioner’s symptoms was inconsistent with
    ADEM. 
    Id. 21-25. Petitioner
    was vaccinated on February 22, 2008. Pet’r’s Ex. 2 at 1. She
    reported her initial symptom, vertigo, during an April doctor’s visit, stating that her symptoms
    dated back “several weeks.” Pet’r’s Ex. 3 at 159-60. On June 20, petitioner told her physicians
    that “on reflection” she had noticed that her “socks seemed too tight on [her] legs” for several
    weeks prior to the onset of her vertigo symptoms. 
    Id. The CSM
    commented that “petitioner’s
    own accounts of her symptom onset [are] inconsistent.” 
    Id. The CSM
    then summarized the
    medical literature presented by the parties’ experts and concluded that it is “clear that ADEM
    most commonly manifests abruptly, although several of the articles Dr. Kinsbourne citied
    furnished the barest of support for his proposition that petitioner’s subacute onset was an
    appropriate—even if aberrant—presentation of ADEM.” 
    Id. at 24.
    The CSM concluded that
    “[t]he timing of petitioner’s symptom onset was unusually protracted” and “does not fit within
    the recognized time frame for most cases of ADEM.” 
    Id. at 25.
            Fifth, the CSM further noted that the nature and severity of petitioner’s symptoms was
    not indicative of ADEM. 
    Id. at 25-27.
    Dr. Kinsbourne and Dr. Cohen agreed that decreased
    level of consciousness, sometimes resulting in coma, is a common symptom of ADEM. 
    Id. Petitioner did
    not exhibit this symptom. 
    Id. The parties
    disputed whether the ADEM symptoms petitioner did exhibit rose to the level
    of typical ADEM symptoms. 
    Id. The CSM
    found that “[t]he views of the parties’ experts are
    inconclusive” because they did not have the opportunity to observe petitioner firsthand. 
    Id. As a
    result, the CSM was “informed . . . by the silence of petitioner’s treaters—who did observe her—
    on the matter of her symptom severity.” 
    Id. The CSM
    determined that the lack of evidence
    demonstrating decreased consciousness and relatively low symptom severity suggested petitioner
    did not suffer from ADEM. 
    Id. Finally, the
    CSM found that the protracted course of petitioner’s injury and limited
    recovery demonstrated that her condition was not caused by ADEM. 
    Id. at 27-28.
    The CSM
    stated that “[t]he record indicates that petitioner’s condition did not plateau and then gradually
    improve—as would be expected with a case of ADEM. Instead, petitioner struggled . . . with a
    protracted clinical course marked by many periods of exacerbation.” 
    Id. The CSM
    concluded
    that the “course of petitioner’s illness strongly suggests that she did not suffer from ADEM” and
    that “[p]etitioner’s overall clinical course was inconsistent with the well-recognized course of
    ADEM.” 
    Id. Weighing these
    six factors, the CSM determined that petitioner “failed to prove by
    preponderant evidence that she developed ADEM.” 
    Id. at 28.
    Rather, the CSM found that
    petitioner “appear[s] to suffer from another, unspecified illness that has bewildered her
    - 7 -
    physicians.” Stillwell I at 16. Relying on precedents set by the Court of Appeals for the Federal
    Circuit (“Federal Circuit”) in Broekelschen and Lombardi, the CSM concluded that the failure of
    petitioner to establish the alleged injury of ADEM precluded the CSM from finding that this
    injury had been caused by petitioner’s flu vaccination. In light of this ADEM failure of proof,
    the CSM determined that petitioner was not entitled to compensation under the Vaccine Act. 
    Id. Nonetheless, in
    “an abundance of caution,” the CSM proceeded to apply the Althen test for
    causation, and concluded that petitioner failed to satisfy this test.
    On July 9, 2013, petitioner filed a timely motion to review the CSM’s decision. This
    matter is now ripe for decision.
    II. STANDARD OF REVIEW FOR VACCINE ACT CASES
    The Court of Federal Claims has jurisdiction to review the decision of a special master in
    a Vaccine Act case upon a properly filed petition for review. 42 U.S.C. § 300aa—12(e)(1).
    When reviewing a special master’s decision, the court must take one of the following three
    courses of action:
    (A) Uphold the findings of fact and conclusions of law of the
    special master and sustain the special master’s decision,
    (B) Set aside any findings of fact or conclusion of law of the
    special master found to be arbitrary, capricious, an abuse of
    discretion, or otherwise not in accordance with law and issue
    its own findings of fact and conclusions of law, or
    (C) Remand the petition to the special master for further action in
    accordance with the court’s decision.
    42 U.S.C. § 300aa–12(e)(2).
    In Vaccine Act cases, the court applies different standards of review to different aspects
    of a special master’s decision: the court reviews conclusions of law under the “not in accordance
    with law” standard, findings of fact under the deferential arbitrary and capricious standard, and
    discretionary rulings under the abuse of discretion standard. Masias v. Sec’y of Health & Human
    Servs., 
    634 F.3d 1283
    , 1287-88 (Fed. Cir. 2011) (construing 42 U.S.C. § 300aa–12(e)(2)(B)); see
    also Munn v. Sec’y of Dep’t of Health & Human Servs., 
    970 F.2d 863
    , 871 no. 10 (Fed. Cir.
    1992); Pafford v. Sec’y of Health and Human Servs., 
    64 Fed. Cl. 19
    , 27 (2005), aff’d, 
    451 F.3d 1352
    (Fed. Cir. 2006).
    With regard to a special master’s conclusions of law, such as conclusions regarding legal
    standards and burdens of proof, the court applies the “not in accordance with law standard.” Doe
    93 v. Sec'y of Health & Human Servs., 
    98 Fed. Cl. 553
    , 566 (2011). Under this legal standard, a
    special master’s application of the law is not entitled to any deference. Jarvis v. Sec’y of Health
    and Human Servs., 
    99 Fed. Cl. 47
    , 58 (2011); see also 
    Althen, 418 F.3d at 1278
    –79 (observing
    that this court's “not in accordance with law” review of a special master's decision in a Vaccine
    Act case is de novo); Saunders v. Sec'y of Dep't of Health & Human Servs., 
    25 F.3d 1031
    , 1033
    (Fed. Cir. 1994) (“Because [the special master’s award of attorneys’ fees] is a legal question, we
    - 8 -
    apply the “not in accordance with law” standard. Thus, we review the special master's award de
    novo . . .”).
    In contrast, a special master’s findings of fact are reviewed under the arbitrary and
    capricious standard, which is “well understood to be the most deferential possible.” 
    Munn, 970 F.2d at 870
    . “Congress assigned to a group of specialists, the Special Masters within the Court
    of Federal Claims, the unenviable job of sorting through these painful cases and, based upon
    their accumulated expertise in the field, judging the merits of the individual claims.” Deribeaux
    ex rel. Deribeaux v. Sec’y of Health & Human Servs., 
    717 F.3d 1363
    , 1366 (Fed. Cir. 2013)
    (quoting Hodges v. Sec’y of Dept. of Health & Human Servs., 
    9 F.3d 958
    , 961 (Fed. Cir. 1993)
    (internal citations omitted)).
    Accordingly, it is not the role of this court to “reweigh the factual evidence,” “assess
    whether the special master correctly evaluated the evidence,” or “examine the probative value of
    the evidence or the credibility of the witnesses.” Lampe v. Sec’y of Health & Human Servs., 
    219 F.3d 1357
    , 1360 (Fed. Cir. 2010). “If the special master ‘has considered the relevant evidence of
    record, drawn plausible inferences and articulated a rational basis for the decision, reversible
    error will be extremely difficult to demonstrate.’” Hibbard v. Sec’y of Health & Human 
    Servs., 698 F.3d at 1363
    (quoting Hines on Behalf of Sevier v. Sec’y of Dep’t of Health & Human Servs.,
    
    940 F.2d 1518
    , 1528 (Fed. Cir. 1991)). In other words, the court is “not to second guess [a]
    [s]pecial [m]aster’s fact-intensive conclusions; the standard of review is uniquely deferential for
    what is essentially a judicial process.” Hodges v. Sec’y of Health & Human Servs., 
    9 F.3d 958
    ,
    961 (Fed. Cir. 1993).
    Finally, the court reviews a special master’s discretionary rulings for “abuse of
    discretion.” 
    Munn, 970 F.2d at 870
    n. 10. Such rulings typically include review of evidentiary
    rulings. See, e.g. Piscopo v. Sec’y of Health & Human Servs. 
    66 Fed. Cl. 49
    , 53 (2005). “An
    abuse of discretion may be found when (1) the court's decision is clearly unreasonable, arbitrary,
    or fanciful; (2) the decision is based on an erroneous conclusion of the law; (3) the court's
    findings are clearly erroneous; or (4) the record contains no evidence upon which the court
    rationally could have based its decision.” Hendler v. United States, 
    952 F.2d 1364
    , 1380 (Fed.
    Cir. 1991); Woods v. Sec'y of Health & Human Servs., 
    105 Fed. Cl. 148
    , 151 (2012).
    III. DISCUSSION
    A. Vaccine Act Standards
    The Vaccine Act, 42 U.S.C. §§ 300aa–1 to –34, established the National Vaccine Injury
    Compensation Program to compensate individuals injured by vaccines “quickly, easily, and with
    certainty and generosity.” H.R. Rep. No. 99–908, at 6 (1986), 1986 U.S.C.C.A.N. at 6344. The
    Vaccine Act allows petitioners to seek compensation if they have “sustained, or ha[ve]
    significantly aggravated” any “vaccine-related” “illness, disability, injury, or condition” caused
    by a vaccine. 42 U.S.C. § 300a-11(c)(1)(C).
    The Act provides petitioners two avenues for obtaining compensation: “table” and “off-
    table” claims. W.C. Sec’y of Health & Human Servs., 
    704 F.3d 1352
    , 1355 (Fed. Cir. 2013). In
    a table claim, if the petitioner can demonstrate that they received a vaccine listed in the Vaccine
    Injury Table and that they suffered an injury within the time period defined by the table, the
    - 9 -
    petitioner “benefits from a statutory presumption of causation.” 
    Id. But if
    the injury is not listed
    in the table, the petitioner must establish actual causation “by a preponderance of the evidence.”
    Id.; 42 U.S.C. § 300aa-13(a)(1). Stated another way, a petitioner making an off-table claim must
    present evidence showing that the vaccine “more likely than not” caused the injury. Capizzano
    v. Sec’y of Health & Human Servs., 
    440 F.3d 1317
    , 1326 (Fed. Cir. 2006). Since ADEM is not
    an injury listed on the Vaccine Injury Table, see 42 C.F.R. § 100.3, this case presents an off-table
    claim.
    In order to meet the preponderance of the evidence requirement for successfully bringing
    an off-table claim, the petitioner has the burden of satisfying the following three-prong test set
    forth in Althen v. Sec’y of Health & Human Servs.:
    Concisely stated, [petitioner’s] burden is to show by preponderant
    evidence that the vaccination brought about her injury by
    providing: (1) a medical theory causally connecting the vaccination
    and the injury; (2) a logical sequence of cause and effect showing
    that the vaccination was the reason for the injury; and (3) a
    showing of a proximate temporal relationship between vaccination
    and injury. If [petitioner] satisfies this burden, she is entitled to
    recover unless the [government] shows, also by a preponderance of
    evidence, that the injury was in fact caused by factors unrelated to
    the vaccine.
    
    418 F.3d 1274
    , 1278 (Fed. Cir. 2005).
    In Althen, the Federal Circuit emphasized that the Vaccine Act does not require exact or
    conclusive evidence of causation, but a medically credible theory coupled with evidence of a
    proximate temporal and causal relationship between the injury and the vaccination. See 
    Althen, 418 F.3d at 1281-1282
    (stating that “the purpose of the Vaccine Act's preponderance standard is
    to allow the finding of causation in a field bereft of complete and direct proof of how vaccines
    affect the human body”).
    Generally speaking, this standard simply requires the special master to consider whether
    there is preponderant evidence showing that the vaccine caused the alleged injury. “The function
    of a special master is not to ‘diagnose’ vaccine-related injuries, but instead to determine based on
    the record evidence as a whole and the totality of the case, whether it has been shown by a
    preponderance of the evidence that a vaccine caused [petitioner’s] injury.” 
    Lombardi, 656 F.3d at 1352-53
    (quoting Andreu ex rel. Andreu v. Sec'y of Dep't of Health & Human Servs., 
    569 F.3d 1367
    , 1382 (Fed. Cir. 2009)).
    Although the Vaccine Act does not require absolute precision, it does require the
    petitioner to establish an injury—the Act specifically creates a claim for compensation for
    “vaccine-related injury or death.” 42 U.S.C. § 300aa-11(c) (emphasis added). Accordingly, the
    Federal Circuit has held, in a series of recent decisions beginning with Broekelschen v. Sec’y of
    Health and Human Servs., 
    618 F.3d 1339
    (Fed. Cir. 2010), that if the special master finds, as a
    preliminary matter, that petitioner has failed to substantiate the alleged injury, the special master
    need not apply the Althen test for causality.
    - 10 -
    In Broekelschen, the petitioner experienced symptoms attributable to either transverse
    myelitis (“TM”) or anterior spinal artery syndrome, and had received differential diagnoses for
    those two conditions. Petitioner argued that his flu vaccination caused him to suffer TM, a
    neurological disorder that has been causally connected with the flu vaccine. Respondent
    disputed this assertion, and argued that petitioner had suffered anterior spinal artery syndrome, a
    vascular disorder that is not caused by the flu vaccine. See 
    id. at 1342-44.
    The Special Master
    found that the record supported respondent’s position, and denied the petition without applying
    the Althen test.
    The Broekelschen court observed that “the instant action is atypical because the injury
    itself is in dispute, the proposed injuries differ significantly in their pathology, and the question
    of causation turns on which injury [petitioner] suffered.” 
    Id. at 1346
    (emphasis added). The
    court, in a 2-1 opinion, upheld the Special Master’s approach, stating that “[m]edical recognition
    of the injury claimed is critical and by definition a ‘vaccine-related injury’ . . . has to be more
    than just a symptom or manifestation of an unknown injury.” 
    Id. at 1349.
    The court
    distinguished the case from Andreu,
    "where the parties agreed that the petitioner suffered from a seizure
    disorder . . . or Kelley, where the competing diagnoses were
    variants of the same disorder . . . . Here, nearly all of the evidence
    on causation was dependent on the diagnosis of [petitioner’s]
    injury. Therefore, it was appropriate for the special master to first
    find which of [petitioner’s] diagnoses was best supported by the
    evidence presented in the record before applying the Althen test.”
    
    Id. at 1346
    (discussing 
    Andreu, 569 F.3d at 1378
    and Kelley Sec’y of Health and Human Servs.,
    
    68 Fed. Cl. 84
    , 100-01 (2005)).
    In Lombardi, the Federal Circuit also affirmed a special master assessing the injury
    claimed by petitioner without applying the Althen test. 
    Lombardi, 656 F.3d at 1352-53
    . The
    petitioner in that case was afflicted with pain radiating into her right chest and with chronic
    fatigue, beginning shortly after she had received a third dose of the hepatitis B vaccine. The
    petitioner visited a number of doctors, who struggled to identify the etiology of her condition.
    The petition itself “did not identify any injuries, but claimed that [petitioner] had sought frequent
    medical treatment following the vaccination.” 
    Id. at 1348.
    The petitioner’s expert witnesses
    suggested several possible conditions that had been causally associated with the hepatitis B
    vaccine but were not listed on the Vaccine Injury Table. Respondent’s witnesses argued that
    petitioner did not suffer from any of these conditions, but suggested several alternatives not
    causally associated with the vaccine. See 
    id. at 1345-49.
            The Special Master in Lombardi analyzed the evidence in the record and concluded that
    petitioner had “not established that she suffers from any of the three conditions that provide the
    basis for her experts’ opinions.” 
    Id. at 1349
    (quoting Doe 60 v. Sec’y of Health & Human Servs.,
    No. 99–VV–523, 
    2010 WL 1506010
    (Fed. Cl. Mar. 26, 2010)). The Special Master found the
    cause of petitioner’s condition elusive and denied compensation under the Vaccine Act, without
    reaching the Althen test. 
    Id. The Federal
    Circuit affirmed the Special Master’s approach,
    holding that “[i]n the face of such extreme disagreement among well-qualified medical experts,
    each of whom had evaluated the petitioner, it was appropriate for the Special Master to first
    - 11 -
    determine what injury, if any, was supported by the evidence in the record before applying the
    Althen test to determine causation. In the absence of any specific injury of which petitioner
    complains, the question of causation is not reached.” 
    Lombardi, 656 F.3d at 1352-53
    (emphasis
    added) (internal citations removed).
    Initially, the scope of the Broekelschen and Lombardi opinions was subject to dispute.
    Previous opinions on this court, for instance, have narrowly characterized Broekelschen and
    Lombardi as “exceptions to the general rule” that “a special master should not conduct a
    differential diagnosis, at the outset of the causation analysis, to choose one diagnosis over
    another, or over a combination of diagnoses.” Contreras v. Sec’y of Health and Human Servs.,
    
    107 Fed. Cl. 280
    , 293 (2012). The court, in Contreras, argued that Broekelschen only applied in
    cases where “two competing diagnoses of dissimilar diseases” are presented. 
    Id. at 293.
    That
    opinion characterized the injury analysis from Broekelschen and Lombardi “as a first step in the
    causation analysis.” 
    Id. The Contreras
    court construed Lombardi narrowly, limiting it to “an
    unusual case where: (1) the petitioner presents conflicting diagnoses of her alleged vaccine
    injury; (2) the experts have ‘extreme disagreement’ as to the malady suffered; and (3) the
    diagnoses are not along a continuum of similar conditions.” 
    Id. at 294-95.
            In the meantime, the Federal Circuit has taken a different approach. Several months after
    Contreras was decided, the Federal Circuit issued Hibbard v. Sec’y of Health and Human
    Services, 
    698 F.3d 1355
    (2012), a case that expanded the scope of the Broekelschen and
    Lombardi rulings. Hibbard, unlike Broekelschen and Lombardi, did not feature dueling theories
    of the nature of the injury afflicting the petitioner. In Hibbard, it was uncontroverted that
    petitioner suffered from dysautonomia, a dysfunction of the automatic nervous system. 
    Id. The only
    dispute was whether a flu vaccination caused petitioner to suffer postural orthostatic
    tachycardia syndrome (“POTS”), a limited form of autonomic neuropathy that manifests itself as
    dysautonomia, or whether petitioner’s dysauonomia was caused by some other factor. 
    Id. Respondent challenged
    whether petitioner could prove by a preponderance of the evidence that
    petitioner had suffered POTS, but in contrast to Broekelschen and Lombardi, did not offer any
    alternate theory of causation. 
    Id. The Special
    Master found the evidence for POTS inconclusive,
    and denied compensation without applying Althen. 
    Id. Petitioner, in
    response, argued that this
    approach conflicted with the burden-sharing test set forth in Althen. 
    Id. The Federal
    Circuit, in Hibbard, upheld the Special Master’s decision, without any of the
    qualifying language used in Broekelschen and Lombardi. The court held that:
    “[i]f a special master can determine that a petitioner did not suffer
    the injury that she claims was caused by the vaccine, there is no
    reason why the special master should be required to undertake and
    answer the separate (and frequently more difficult) question
    whether there is a medical theory, supported by ‘reputable medical
    or scientific explanation,’ by which a vaccine can cause the kind of
    injury that the petitioner claims to have suffered.”
    
    Hibbard, 698 F.3d at 1365
    . The court explicitly expanded the scope of the injury inquiry by
    contrasting the facts of the case with “previous cases” like Lombardi and Broekelschen, in which
    there was an actual dispute as to which injury afflicted the petitioner. See also Hibbard, 698
    - 12 -
    F.3d at 1370-71 (O’Malley, J., dissenting) (criticizing the majority for extending Broekelschen
    “well beyond its facts”).
    This approach also differs markedly from the “general rule” that a special master should
    avoid selecting among differential diagnoses—the court held that “even assuming the medical
    plausibility of [petitioner’s] theory of causation—that the vaccine triggered an immune response
    that damaged her autonomic nerves—her failure to show that she had autonomic neuropathy
    would be fatal to her case” because “whether [petitioner] suffers from autonomic neuropathy . . .
    was a necessary component to her theory of vaccine-induced injury.” 
    Id. at 1365.
    C.f. 
    Andreu, 569 F.3d at 1378
    (holding that petitioner was not required to prove whether petitioner had
    suffered a febrile or afebrile seizure because the parties agreed that toxins in the TBT vaccine
    can cause seizures, even if there was disagreement in the scientific literature as to whether the
    vaccine could cause afebrile seizures); 
    Kelley, 68 Fed. Cl. at 100-01
    (2005) (holding that
    petitioner was not required to precisely categorize his injury where the two possible diagnoses
    were “variants of the same disorder”).
    B. Review of the Special Master’s Decision
    1. The Special Master Correctly Applied the Law
    Petitioner argues that “the Chief Special Master erred as a matter of law in applying the
    Lombardi approach to the present case” because this case “involv[ed] a question as to the
    classification of a disease within an identified disease process, rather than whether an
    unidentified disease process exists.” 
    Id. at 14.
    In essence, petitioner contends that the CSM
    errantly treated the uncertainty as to the sub-type of petitioner’s demyelinating encephalomyelitis
    (ADEM, MS, or other) as if the cause of petitioner’s injuries was unknown. 
    Id. Petitioner argues
    that “the sub-classification . . . is of assistance [solely] for medical purposes, in the
    treatment of the disease process.” 
    Id. at 5.
    Petitioner asserts that she undisputedly “suffers from
    an acquired demyelinating encephalomyelitis involving lesions at the pons and mid-areas of her
    brain.” Pet’r’s Mot. at 4.
    As explained above, the court reviews legal conclusions, such as the CSM’s decision to
    apply Lombardi, under the “not in accordance with law” standard. 
    Masias, 634 F.3d at 1287-88
    (construing 42 U.S.C. § 300aa–12(e)(2)(B)).
    Applying this standard, the court affirms the CSM’s application of Lombardi. Petitioner
    simply misstates the law as it currently stands. Although the Federal Circuit has continued to
    recite the general principle that it is not the role of a special master to engage in differential
    diagnosis, the Federal Circuit has increasingly emphasized that a petitioner must, as a
    preliminary matter, establish a specific injury in order for the Althen test to come into play.
    Critically, Federal Circuit precedent dictates that the petitioner has the burden of proving, by the
    preponderance of the evidence, that they are actually afflicted by the injury which, under their
    theory of vaccine-induced injury, was caused by the vaccine. See 
    Hibbard, 698 F.3d at 1365
    . A
    “vaccine-related injury” must be “more than just a symptom or manifestation of an unknown
    injury[;]” “[m]edical recognition of the injury claimed is critical.” 
    Broekelschen, 618 F.3d at 1349
    .
    The court is not persuaded by petitioner’s argument that a precise ADEM diagnosis is not
    necessary. Petitioner’s ADEM diagnosis is clearly a “necessary component to her theory of
    - 13 -
    vaccine-induced injury.” 
    Hibbard, 698 F.3d at 1365
    . This is demonstrated by the fact that the
    evidence presented before the CSM related to ADEM, not demyelinating diseases generally or
    other demyelinating diseases. Petitioner’s expert witness specifically alleged that petitioner
    suffered from “an atypical example of the subacute onset of demyelinating brain stem
    encephalitis, a variant of ADEM.” Pet’r’s Ex. 8 at 3. Moreover, petitioner cited studies by Poser
    (1982), Saito et al. (1980), Shoji and Kaji (2003), Miyamoto et al. (1996), Ravaglia et al. (2004),
    etc. in support of the proposition that ADEM, in particular, can be triggered by the flu vaccine.
    
    Id. at 4-5.
    As respondent notes, “[t]he theories put forth by petitioner’s expert all relied on a
    diagnosis of ADEM, and thus this particular diagnosis lies at the very crux of petitioner’s case-
    in-chief.” Res. at 9. Thus, Hibbard dictates that petitioner’s failure to establish that she has
    ADEM is fatal to her case.
    For these reasons, the court finds that the CSM did not err by considering whether
    petitioner had demonstrated she suffered from a vaccine-caused ADEM injury by a
    preponderance of the evidence in the record, as a predicate to applying the Althen test. Because
    petitioner’s arguments and expert testimony centered on a diagnosis of ADEM, the CSM did not
    err in applying Lombardi once she determined that petitioner had not carried her burden of
    establishing that she suffered from ADEM.
    2. The Special Master’s Factual Findings Were Not Arbitrary or Capricious
    Petitioner also argues that the CSM acted arbitrarily and capriciously in finding that
    petitioner had failed to prove, by a preponderance of the evidence, that she was suffering from
    ADEM. Pet’r’s Mot. at 1. Petitioner insists that the CSM erroneously focused on whether
    petitioner was actually suffering from ADEM, “rather than whether [p]etitioner’s disease was
    within the medically accepted guidelines of ADEM.” Pet’r’s Mot. at 14. Petitioner
    acknowledges that her symptoms do not match those typically exhibited by ADEM patients, but
    insists that she suffers from an “atypical” variant of ADEM. 
    Id. at 1.
            As explained above, the CSM cited the following six reasons for finding that petitioner
    was not suffering from ADEM, or even an “atypical” variant thereof: (1) the statistical
    probability that petitioner suffers from ADEM, (2) the absence of an ADEM diagnosis from her
    treating physicians; (3) the appearance of her brain lesion in the MRI; (4) the slow onset of her
    symptoms; (5) the nature and severity of her symptoms; and (6) the protracted course of her
    illness and her limited recovery. Stillwell I at 16-28. In short, the CSM found that “petitioner’s
    onset, symptoms, and the course of her illness diverge in too many respects and by too great a
    degree from the presentation of ADEM to even be deemed an atypical form of ADEM.” Id
    (emphasis added).
    Petitioner disputes the CSM’s finding that Ms. Stillwell was not suffering from ADEM.
    Petitioner argues that it was improper for the CSM to consider that most victims of ADEM are
    young children or adolescents because Dr. Kinsbourne introduced evidence that it is possible for
    ADEM to afflict adults. Pet’r’s Mot. at 5-6. Petitioner also argues that the absence of an ADEM
    diagnosis by any of petitioner’s treating physicians is irrelevant because “a physician’s purpose
    in classifying a disease process is to determine a course of medical treatment and prognosis – and
    not to establish a causative factor which may be necessary in a legal proceeding.” 
    Id. at 6.
    Additionally, petitioner acknowledges that ADEM usually produces separate, or multifocal,
    lesions that are visible in MRIs, but insists that several studies cited by Dr. Kinsbourne support
    - 14 -
    the possibility that some cases of ADEM may exhibit unifocal lesions. 
    Id. at 6-8.
    Petitioner also
    acknowledges that the onset of ADEM symptoms is usually rapid, but argues that an onset of
    four weeks after the vaccination is nevertheless “within the generally acceptable onset.” 
    Id. at 9-
    10. Additionally, petitioner disputes respondent’s argument that the severity of petitioner’s
    symptoms was inconsistent with symptoms typically caused by ADEM. 
    Id. at 10-12.
    Finally,
    petitioner argues that even if petitioner’s protracted course of injury was atypical, it was still
    within the acceptable range for ADEM. 
    Id. at 12-13.
            As explained in the preceding section, petitioner has the burden of establishing, by the
    preponderance of the evidence, that she actually suffers from the specific injury she alleges was
    caused by the vaccination. 
    Hibbard, 698 F.3d at 1365
    ; see also 
    Broekelschen, 618 F.3d at 1349
    (holding that petitioner must establish that she suffers from a “vaccine-related injury,” not
    merely “a symptom or manifestation of an unknown injury”); 
    Lombardi, 656 F.3d at 1553
    (holding that petitioner must successfully establish a “specific injury”). Whether petitioner has
    successfully satisfied this burden is clearly a factual question, which is reviewed under the
    arbitrary and capricious standard. See 
    Hibbard, 698 F.3d at 1363
    , 1365. Under this deferential
    standard, the court must uphold factual findings if the special master has considered the record
    and made plausible inferences. 
    Id. at 1363
    (quoting Hines on Behalf of 
    Sevier, 940 F.2d at 1528
    ).
    Plainly, petitioner disagrees with the CSM’s assessment of the evidence. Nevertheless,
    the court finds that the CSM’s factual findings are clearly supported by the record and therefore
    are not arbitrary and capricious. As explained above, there is no specific marker for ADEM.
    Rather, in identifying ADEM, both clinical findings and laboratory evidence must be taken into
    account. Thus, in considering whether petitioner was suffering from ADEM or some other
    malady, the court finds that it was reasonable for the CSM to consider a number of probabilistic
    factors, such as the typical age of individuals afflicted by ADEM, the typical course of illness,
    severity of symptoms, and others.
    The CSM summarized the typical characteristics of ADEM, and carefully elucidated six
    factors that weighed against a finding that petitioner was suffering from ADEM. In light of the
    fact that petitioner’s symptoms were undisputedly “atypical,” not just in one respect but on
    multiple levels, the court concludes that the CSM’s finding is substantially supported by the
    record on the whole.
    Finally, petitioner’s argument that the CSM should have focused on whether her “disease
    was within the medically accepted guidelines of ADEM” rather than whether petitioner actually
    suffered ADEM plainly misstates the law. As explained in the preceding section, petitioner has
    an affirmative burden of showing, by the preponderance of the evidence, that she actually suffers
    from the specific injury she alleges was caused by the vaccination. 
    Hibbard, 698 F.3d at 1365
    .
    For the foregoing reasons, the court finds that the CSM did not act arbitrarily or
    capriciously in finding that petitioner does not suffer ADEM.
    ***********
    - 15 -
    The ratio decidendi of the CSM’s decision is that petitioner “failed to prove by
    preponderant evidence that she developed ADEM.” Stillwell I at 28-29. As the CSM noted, this
    determination “precludes a finding of causation” and thus obviates any need to apply the Althen
    test for causation. Id. (citing 
    Lombardi, 656 F.3d at 1352-53
    ).
    But, in “an abundance of caution” the CSM evaluated petitioner’s claim under the Althen
    test’s prongs. Stillwell I at 29. Because the CSM decided the case on Lombardi grounds, the
    CSM’s Althen evaluation is dicta. See e.g. Cohens v. State of Virginia, 
    19 U.S. 264
    , 399-400
    (1821) (remarking that, with regard to dicta, “[i]t is a maxim not to be disregarded, that general
    expressions . . . are to be taken in connection with the case in which those expressions are used . . .
    The reason of this maxim is obvious. The question actually before the Court is investigated with
    care, and considered in its full extent. . . .”). Accordingly, the court does not reach the question
    of whether the CSM’s determination that petitioner did not satisfy the Althen test was arbitrary or
    capricious.
    IV. CONCLUSION
    In sum, the court affirms the Chief Special Master’s determination that petitioner’s claim
    fails under Lombardi. Petitioner has not carried the burden of proving she suffers from a
    vaccine-related injury. Accordingly, the Special Master’s DECISION is AFFIRMED and
    petitioner’s MOTION for review of that decision is DENIED.
    IT IS SO ORDERED.
    s/   Lawrence J. Block
    Lawrence J. Block
    Judge
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