066 Clinical and imaging findings in MOG antibody positive patients presenting to Kings College Hospital

We identified all patients testing positive for MOG antibodies at KCH and reviewed their clinical phenotype and imaging findings. 22 patients tested positive for MOG antibodies between Jan 2015 and Aug 2019 (11 female, mean age 39 (SD 18)). The majority of patients 15/22 presented with optic neuritis, 3 patients bilateral, 2 bilateral sequential. Other presentations included LETM (2), ADEM(2), brain stem syndrome (1), lower cord/conus syndrome (1) seizures (1). Mean logMar visual acuity at nadir in patients present- ing with an optic neuritis was 0.69 (SD 0.58). Mean logMar visual acuity at recovery was logMAR 0.1 (SD 0.54), 12/15 eyes had documented optic disc swelling. MRI brain was performed in 20 patients and was normal in 10, 6 had non-specific white matter changes the remainder had inflammatory brainstem and ADEM –like changes. MRI orbits was performed in 13 patients, 4 had bilateral optic nerve involvement and 5 had longitudinally extensive optic nerve lesions. Spinal cord imaging was performed in 9 patients, 2 had a LETM, 1 multifocal signal change and the remainder normal imaging. The cervical cord was the most frequently involved region of the spinal cord. 5 patients developed relapses (all optic neuritis), 3 relapses occurred off treatment. r.raftopoulos@ucl.ac.uk