What disorder is not considered a type of MS?

Neuromyelitis optica spectrum disorder (NMOSD) is not considered a type of multiple sclerosis (MS). While both conditions affect the central nervous system and can cause similar symptoms, NMOSD primarily targets the optic nerves and spinal cord, leading to distinct clinical features and pathophysiology. Unlike MS, NMOSD is often associated with specific antibodies, such as the aquaporin-4 antibody. Accurate diagnosis is crucial for appropriate treatment and management of these disorders.