<prompt> A 40 year old man having malaise and fatigue, dyspnea on exertion, cardiomegaly on chest X-ray, weight loss of 10 kg, mononeuritis, polyarthritis. The diagnosis isPANSLENeuro AIDSNeurosarcoid  <response>: D Neurosarcoidosis NEUROSARCOIDOSIS generally occurs only in cases of sarcoidosis with substantial systemic involvement, and signs of neurologic involvement usually are seen in patients known to have active disease. Strictly neurologic forms are seen in fewer than 10 of patients; a subset has predominantly neuromuscular involvement. Definitive diagnosis of neurosarcoidosis requires the exclusion of other causes of neuropathy and the identification of noncaseating sarcoid granulomas by histologic analysis of nerve and muscle biopsy specimens. Neurological involvement: Papilledema 6; Cranial neuropathy 59; Peripheral neuropathy 47; Mononeuropathy 25; Myopathy 25; Psychiatric disorders 19; Cerebellar ataxia 13 Hydrocephalus 6 