[Primary extragonadal choriocarcinoma of the bladder. A case report with a compilation of the 19 cases published so far].

We report on a 73-year-old man with a primary extragonadal choriocarcinoma of the urinary bladder associated with transitional cell carcinoma. So far only 19 cases of choriocarcinoma of the bladder have been published in the literature. With reference to the cases reported in the English literature, the relationships between serum beta-HCG level, mode of therapy and clinical course are pointed out. Finally, the possible explanations for pathogenesis are discussed and the signs and symptoms that are mandatory for diagnosis of this entity are defined.