Utility of the 2023 international MOGAD panel proposed criteria in clinical practice: An institutional cohort.

Background: Myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD) is a recently defined demyelinating disorder with a rapidly evolving clinical spectrum. Recently, consensus criteria have been proposed (Banwell et al., 2023) to help with disease diagnosis. However, validation of the proposed criteria in real-life MOGAD patients is lacking. In this study, we applied the proposed criteria to an institutional cohort of MOG antibody-positive patients.

Methods: A retrospective study was conducted at a tertiary neuroimmunology clinic from 2018 to 2023. Patients who had at least one core clinical feature of MOGAD and positive serum MOG antibody by cell-based assay were included. Demographics and clinical data were recorded and analyzed. Cases were divided into definite MOGAD, questionable MOGAD, and false-positive MOG antibody as determined by the treating neuroimmunology and/or neuro-ophthalmology specialists prior to applying the new MOGAD criteria by an independent investigator. We then calculated the sensitivity, specificity, positive predictive value, and negative predictive value of the new criteria compared to the treating physicians' assessment.

Results: A total of 27 patients were included of which, 19 (70.4%) were female, the average age of the sample was 44 +/- 15 years. High titer MOG antibody (≥ 1:100) was found in 11 patients (40.7%); low titer (< 1: 100) in 13 (48.1%), and unreported titer in 3 patients. As determined by expert opinion; 18 (66.7%) were identified as definitive MOGAD, 6 (22.2%) as false-positive MOG antibody, and 3 (11.1%) as questionable MOGAD. All 18 patients identified by clinicians as definite MOGAD met the new 2023 criteria. Of the 9 patients with questionable MOGAD or false-positive MOG antibody, four patients met the 2023 MOGAD criteria. Those four patients had the following final diagnoses: CNS vasculitis, primary progressive MS with activity and progression, pseudotumor cerebri, and bevacizumab-induced anterior ischemic optic neuropathy in the setting of paraneoplastic retinopathy. Compared to clinician assessment, applying the 2023 MOGAD criteria to our institutional cohort yielded a sensitivity of 100%, a specificity of 55.5%, a positive predictive value of 81.5% and a negative predictive value of 100%.

Conclusion: These findings suggest that the 2023 MOGAD criteria are highly sensitive for detection of definite MOGAD but has modest specificity. A number of MOGAD mimickers can resemble the core clinical events of MOGAD and share similar supportive clinical and MRI features. Clinicians should practice caution when evaluating patients with low titer MOG antibody even if they meet the additional supportive features proposed by the 2023 criteria. Further studies are needed to evaluate the 2023 criteria in larger cohorts and in the pediatric population.