Primary choriocarcinoma and embryonic carcinoma are very rare tumors of the stomach. Not more than 60 cases of choriocarcinoma have been reported. The tumor occurs in subjects aged between 25

□ Fig. 12. Adenocarcinoma with the signet-ring cell component. A group of fingerlike cancer cells is encircled in the center of the microphotograph. Hematoxylin and eosin, x200

and 80 and produces human chorionic gonadotropin (hCG) [204, 274].

Embryonic carcinoma is also a very rare tumor of the stomach, containing elements comparable to those of the tumor of gonadal endodermal sinus and embryonic carcinoma. Many tumor cells express AFP [207].

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