MedGen

A progressive autoimmune disorder affecting the central nervous system resulting in demyelination. Patients develop physical and cognitive impairments that correspond with the affected nerve fibers. [from NCI]

Conditions characterized by loss or dysfunction of myelin (see myelin sheath) in the brain, spinal cord, or optic nerves secondary to autoimmune mediated processes. This may take the form of a humoral or cellular immune response directed toward myelin or oligodendroglia associated autoantigens. [from MONDO]

Ileocolitis or ileal Crohn's is the most common type of Crohn's disease. It affects both the ileum (small intestine) and the colon. [from MONDO]

A disorder characterized by the degeneration of the nervous system due to autoimmunity. Representative examples include multiple sclerosis, Guillain-Barre syndrome, and myasthenia gravis. [from NCI]

Inflammation of the colon that is characterized by the presence of granulomas. [from NCI]

Inflammatory bowel disease is a systemic disorder comprised of two major disorders: ulcerative colitis and Crohn disease. Crohn disease can affect any part of the digestive system while ulcerative colitis is confined to the colon. Both disorders may affect sites outside of the digestive system [from SNOMEDCT_US]