Familial idiopathic priapism: a case report.

Idiopathic priapism is a diagnosis made by exclusion of identifiable etiologies and is found in 43 to 58 per cent of the cases. We report a case of priapism that was investigated exhaustively and classified as idiopathic. In addition, 3 brothers also reported similar episodes of priapism. Although a common abnormality exists presumably, we were unable to define an etiology. Therefore, this case was designated as familial idiopathic priapism.