[Primary seminal vesicle carcinoma in a 19-year-old male].

A 19-year-old male with papillary adenocarcinoma of the seminal vesicle with cyst is reported. Cytological and histopathological studies were carried out and the relevant literature was perused. There are only 6 cases of carcinoma and 40 cases of cyst of the seminal vesicle in the Japanese literature. Moreover, ours is the first reported case of the co-existence of carcinoma and cyst in the seminal vesicle. There may be a pathogenetic relationship between the carcinoma and cyst in our case.