{Reference Type}: Case Reports {Title}: MOG Antibody-Associated Disease and Thymic Hyperplasia: From the National Multiple Sclerosis Society Case Conference Proceedings. {Author}: Hurtubise B;Frohman EM;Galetta S;Balcer LJ;Frohman TC;Lisak RP;Newsome SD;Graves JS;Zamvil SS;Amezcua L; {Journal}: Neurol Neuroimmunol Neuroinflamm {Volume}: 10 {Issue}: 2 {Year}: 03 2023 {Factor}: 11.36 {DOI}: 10.1212/NXI.0000000000200077 {Abstract}: Myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD) is a recently described CNS inflammatory disorder that may manifest with optic neuritis, myelitis, seizures, and/or acute disseminated encephalomyelitis. While MOG-specific antibodies in patients with MOGAD are IgG1, a T-cell-dependent antibody isotype, immunologic mechanisms of this disease are not fully understood. Thymic hyperplasia can be associated with certain autoimmune diseases. In this report we describe a case of MOGAD associated with thymic hyperplasia in a young adult.