Primary gastric choriocarcinoma: case report with review of world literature.

A case is herin reported of a primary gastric choriocarcinoma occurring in an elderly woman associated with very high titers of circulating chorionic gonadotropin. Unlike the majority of previously reported cases, in which adenocarcinomatous components were present, the tumor in this case was purely trophoblastic. The clinicopathologic findings of the previously reported cases are summarized, along with the various theories of histogenesis.