[A case of so-called carcinosarcoma of the stomach].

A 47-year-old man, whose chief complaint was massive hematoemesis, was underwent partial gastrectomy. The resected stomach revealed a large elevated tumor, Borrmann I type, measuring 4 X 3 X 2 cm, in the anterior wall of the body. Histologically, the major part of the tumor showed a sarcomatous structure, while the margin and some areas consisted of papillary or well differentiated adenocarcinoma, invading to the submucosa. The border between the two components was irregular and the two components intermixed with each other in some areas. In the sarcomatous area, there was no bone, cartilage or muscle. It was interesting that the metastatic lymph nodes disclosed a sarcomatous picture with teratomatous pattern and that immunocytochemically HCG was localized in some of the adenocarcinoma in the lymph node.