[A case of papillary cystadenoma of epididymis].

We present a case of papillary cystadenoma of the right epididymis in a 52-year-old man. He visited our hospital complaining of painless mass in his right scrotum. This painless hard mass was palpable at the head of his right epididymis and was 1 cm in diameter. Right epididymectomy was performed. A histological examination revealed epithelial proliferation of ectatic efferent ducts and microcysts filled with papillary processes, and a diagnosis of papillary cystadenoma of the right epididymis was made. In Japan, our present case is the 12th of papillary cystadenoma of epididymis. We chiefly reviewed the clinical aspects of this disease, especially the relationship between this disease and von Hippel-Lindau's disease.