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  • Title: Anti-MOG associated disorder-Clinical and radiological characteristics compared to AQP4-IgG+ NMOSD-A single-center experience.
    Author: Rempe T, Tarhan B, Rodriguez E, Viswanathan VT, Gyang TV, Carlson A, Tuna IS, Rees J.
    Journal: Mult Scler Relat Disord; 2021 Feb; 48():102718. PubMed ID: 33388560.
    Abstract:
    BACKGROUND: The discovery of two immunoglobulin G (IgG) antibodies against aquaporin 4 (anti-AQP4) and myelin oligodendrocyte glycoprotein (anti-MOG) has led to the distinction of the disorders anti-AQP4 immunoglobulin G positive neuromyelitis spectrum disorder (AQP4-IgG+ NMOSD) and anti-MOG associated disorder (MOGAD). Different clinical and radiological features have been proposed to distinguish these two demyelinating CNS diseases. METHODS: This is a single-center retrospective review at the University of Florida (UF) including all patients with the diagnostic code ICD G36 ("other acute disseminated demyelination") from October 2015 to January 2020 (n=141) and all charts included in the clinical NMOSD database of the UF Division of Neuroimmunology (n=36). A total of 151 cases were reviewed for presence of anti-MOG and anti-AQP4 antibodies and NMOSD diagnostic criteria. Differences in MOGAD and AQP4-IgG+ NMOSD were compared. RESULTS: Of the 151 reviewed patient charts, 11 were consistent with MOGAD and 43 with AQP4-IgG+ NMOSD. Patients with MOGAD were significantly younger at symptom onset compared to patients with AQP4-IgG+ NMOSD (14 [1-33] years vs. 37 [6-82] years; p=0.005). In comparison with AQP4-IgG+ NMOSD, optic neuritis in MOGAD was more frequently associated with bilateral optic nerve involvement: (6/11 [54.5%] vs. 6/43 [13.9%]; p=0.009) and fundoscopic presence of optic disc edema (5/11 [45.5%] vs. 3/43 [7%]; p=0.006). Perineuritis was a common radiological feature in MOGAD (present in 4 cases). In case of myelitis, there was more frequent involvement of the conus medullaris in MOGAD (4/11 [36.4%] vs. 2/43 [4.7%]; p=0.012). Symptomatic cerebral syndrome with supratentorial white matter lesions was seen in MOGAD patients with pediatric onset (pediatric onset: 4/6 [66.7%] vs. adult onset: 0/5 [0%]. In MOGAD, evidence for combined central and peripheral demyelination and increased intracranial pressure was present in one patient each. A preceding inciting event (illness/postpartum) was more frequently identifiable in MOGAD (4/11 [36.4%] vs. 4/43 [7%]; p=0.045). Disability as calculated on the Expanded Disability Status Scale was less severe in MOGAD compared to AQP-IgG+ NMOSD (most severe presentation: 5 [2-7] vs. 7 [1-10]; p=0.015; most recent assessment: 2 [0-5] vs. 5 [0-10]; p=0.045) and patients were more likely to respond to treatment of acute attacks with corticosteroids and/or plasmapheresis (Clinical Global Impression-Global Change scale: 1 [1-4] vs. 3 [1-6]; p=0.001). INTERPRETATION: The study confirms that simultaneous bilateral optic neuritis, presence of optic disc edema, transverse myelitis with conus involvement and a less severe disease course are distinctive features of MOGAD.
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