Malignant fibrous histiocytoma is a primitive mesenchymal tumor usually found in the soft tissues of the extremity or torso of adults. Only two previous reports of this lesion in the abdominal viscera are present in the world medical literature. A case is reported of three synchronous tumors in the rectum, colon, and omentum with the pathologic appearance of malignant fibrous histiocytoma. Although resected completely with a transverse colocolostomy and a low-anterior resection, the expected behavior of this tumor is one of aggressive local recurrence followed by distant metastasis. The clinical and pathologic characteristics of malignant fibrous histiocytoma are reviewed.

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Endoscopic stenting for malignant large bowel obstruction is common nowadays. However, recurrent obstruction secondary to stent occlusion due to tumour ingrowth or overgrowth might occur. We reported a case of a 70-year-old man with large bowel obstruction initially treated with colonic stenting. It was complicated with recurrent intestinal obstruction, with colonoscopy showing stent blockage by tumour ingrowth over distal part of the stent. Successful endoscopic implantation of additional colonic stent over the old stent was achieved and intestinal obstruction was resolved afterwards.