Sarcoid in a Nigerian: geographical variation of the frequency of sarcoid among blacks considered.

A 30-year-old Nigerian male with sarcoid manifested by hilar and peripheral lymphadenopathy is presented. Sarcoid and other immune disorders such as systemic lupus erythematosus and polymyositis are rare in Africa. In contrast, these disorders, and especially sarcoid, display a predisposition for blacks in the USA where blacks are affected by sarcoid 10 times as frequently as whites. The importance of reporting and, where possible, immunological study of African patients with sarcoid is emphasized.