Sarcoidosis is a chronic disorder that affects many body systems.
The disorder involves an abnormal immune system response resulting in deposits of white blood cells and abnormal tissue cells in the affected organ. Neurosarcoidosis may affect any part of the nervous system. Any nerve can be involved, including the nerves of the eye and the nerves that control taste, smell, or hearing. The brain or spinal cord may also be involved. Neurosarcoidosis is a clinically significant complication of sarcoidosis because it increases the risk of permanent disability and, in some cases, death.