A Case of Retrograde Intussusception on the Sigmoid Colon in an Adult

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Retrograde intussusception of the colon is a rare disease in adults. This paper describes our recent experience with a case of retrograde intussusception due to sigmoid colon cancer, with reference to the literature. A 45-year-old woman was admitted to our hospital because of abdominal pain. Computed tomography clearly showed retrograde invagination of the sigmoid colon into the descending colon. Judging from this information, we diagnosed retrograde intussusception of the sigmoid colon, and laparotomy was immediately performed. The sigmoid colon was firmly invaginated into the transverse colon retrogradely and manual repositioning was performed. We performed sigmoidectomy with D2 lymph node dissection. The resected specimen showed a pedunculated polyp (3.0cm) at the top of the intussusception. Microscopic examination clarified that the tumor was a moderately differentiated adenocarcinoma with adenoma component. The depth of invasion was pM.<BR>Computed tomography is useful in the diagnosis of retrograde intussusception of the colon. Since retrograde intussusception is caused by many malignant tumors, in the operation we should consider intestinal tract excision including lymph node dissection.