Abstract
Eight patients with carcinoid tumors of the rectum, were observed in our clinic. The two cases manifested the clinically malignant courses. The one was dead of wide spread metastasis to liver, ten months after anterior resection for 7 cm×5 cm sized carcinoid tumor of the upper rectum, the another is alived with hepatic metastasis, in ten months after pull-through methode operation for the invasive type of tumor sized to walnut. In these cases, histochemical reaction of the tumor cells is positive to Grimelius stain but not to Masson-Fontana stain, while electron micrograph shows secretory granules in the cytoplasm.
