[Ossification arising in the atypical epithelium in primary stomach cancer--report of a case].

We report a case of primary stomach carcinoma arising in the atypical epithelium, which was accompanied with ossification. The patient was a 73-year-old man, who was operated because of the possibility of advanced Type IIa carcinoma. Grossly, a large papillary polypoid lesion was recognized in the anterior wall of the antrum near the pylorus ring. Histological study revealed well differentiated tubular adenocarcinoma arising in the atypical epithelium; ossification was found in the stroma without necrosis, calcification or chondrification. Ossification arising in primary stomach carcinoma is very rare. Only five cases of ossification in primary stomach carcinoma have been reported in the world literature; two of these were Japanese patients. Probably ours is the first reported case with both stomach carcinoma and ossification arising in the atypical epithelium.