[Idiopathic calcinosis of the scrotum: a case report].
A 25-year-old man complained of painless, firm scrotal nodules which increased in number and size for the last 7 years. Physical examination was unremarkable except for many, firm painless nodules near the scrotal raphe. Preoperative diagnosis was multiple scrotal tumors of unknown etiology. Surgical excision was performed under epidural anesthesia. On microscopic examination, the nodules were located in the dermis and composed of calcified material which was positive with the von Kossa calcium stain. There were numerous foreign giant cells and dense fibrosis at the margins of the lesions. Idiopathic calcinosis of the scrotum was the final diagnosis. Although its etiology is unknown, the literature reviewed supported the view that the mast cell accumulation and its degranulation are related to idiopathic calcinosis of the scrotum.