Adult Onset of Acute Disseminated Encephalomyelitis (ADEM) With Associated Myelin Oligodendrocyte Glycoprotein (MOG) Antibody.

ADEM is an inflammatory and demyelinating autoimmune disorder of the central nervous system (CNS). One recognized cause of ADEM is myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD). MOGAD affects approximately one in 10,000 people worldwide and is more prevalent in children. Patients typically present with optic neuritis, ADEM, and transverse myelitis. Many patients will experience relapses of demyelinating attacks, and thus, both acute and maintenance therapies are typically used to manage the disease. This case considers an adult female who presented with neurological deficits as a result of MOG-associated ADEM. She had minimal response to traditional therapies but responded well to treatment with IV immunoglobulin (IVIG). This case report explores her clinical course as well as unique clinical significance and conclusions due to the nontraditional use of IVIG.