@Neurosarcoidosis is an autoimmune condition that causes "inflammation and abnormal cell deposits in any part of the nervous system—the brain, spinal cord, or peripheral nerves." "Symptoms of cranial neurosarcoidosis are varied and commonly include headache, ataxia, visual disturbances, fatigue, nausea and vomiting...weakness, sensory disturbances, seizures, cognitive dysfunction, eye pain, depression, aphasia, and tremor" (US NIH)
I've not seen any discussion of neurosarc here on Mastodon.