[Small Intestinal Leiomyosarcoma Diagnosed with Intussusception-A Case Report].

A 87-year-old man presented to our hospital with intermittent abdominal pain. We diagnosed intussusception of the small intestine by CT and performed laparoscopic-assisted partial resection of the small intestine. It was diagnosed as small intestine leiomyosarcoma by pathological examination and the operation was curative. Leiomyosarcoma is rare among small intestinal tumors, and since 1999, when immunostaining was used to define small intestinal leiomyosarcoma, there have been only 15 confirmed cases in Japan, including our own case. Of the 15 cases, 5 died within an average of about 17 months, making it a disease with a poor prognosis. On the other hand, considering that there are multiple cases that have maintained recurrence-free survival with only local resection without lymph node dissection, and that non-surgical reduction is less effective in cases involving neoplastic small bowel intussusception, we believe that performing early local resection using minimally invasive laparoscopy is effective.