[Multiple gastric carcinoma with a coexisting gastric carcinoid--report of a case].

A 54-year-old man was operated on for multiple gastric carcinoma. A carcinoid tumor was found within Borrmann 3 type adenocarcinoma (well-differentiated) through examination of the resected stomach. Another carcinoma was II c type, moderately differentiated. The carcinoid seemed to be so-called submucosal tumor on the cut surface. Histologically, the carcinoid showed a less-differentiated trabecular arrangement, which was classified as the Soga D type. Argyrophilic reaction was positive (Grimelius) and argentaffin negative (Masson-Fontana). Secretory granules were seen by electron microscopy. Carcinoid syndrome was absent, and postoperative assays of 5-HT and 5-HIAA were within normal range.