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Four cases of ischemic enterocolitis without arterio-occlusive lesion were described. Three cases were associated with sigmoid colon carcinomas. Ischemic lesions developed anal to the carcinomas in two cases, and oral to sigmoidostomy to relieve intestinal obstruction by carcinoma in one case. One other case was associated with inguinal hernia. Grossly, ischemic lesions involved relatively short intestinal segments, and the ischemic colonic lesions were not related to teniae colt. Extensive veno-occlusive lesions were discovered in a case of ischemic stricture of the ileum, which had been incarcerated in the right inguinal hernia. Reversible mechanical occlusion of the intestinal vessels caused by transient or recurrent intestinal strangulation is the most probable cause of these ischemic lesions.. ACTA PATHOL. JPN. 33: 249-256, 1983. Materials and MethodAmong the 171 cases of resected colorectal carcinomas, examined in the Department of Pathology, Jichi Medical School, between April 1974 and March 1981, three cases were associated with ischemic colitis. In addition, a typical ischemic stricture was discovered in the ileum, which had been incarcerated in the right inguinal hernia. These four cases constitute the present study

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