[Tunica albuginea cyst: a case report].

A 47-year-old male visited our hospital complaining of painless swelling of the right scrotum. Ultrasonography demonstrated hydrocele and a 13 x 12 x 10 mm cystic space along the margin of the right testis. Hydrocelectomy and simple resection of the cyst were performed. Pathologic examination of the excised cyst showed a serous cyst lined with simple flattened epithelium. Ultrasonography is useful for the diagnosis of tunica albuginea cyst.