We report a rare case of lipomatosis of the sigomoid colon in a 50-year-old women. She presented with intermittent abdominal pain and was admitted to our hospital. She underwent emergency CT scan, which revealed sigmoid colon wall thickening and inflammation of the peripheral fat in adittion to a 6cm stool. An exploratory laparotomy showed impaction of the stool in the inflamed wall of the sigmoid colon. A Hartmann's procedure was subsequently performed. The diseased colon specimen revealed multiple submucosal tumors up to 40mm in diameter. The histopathological diagnosis was submucosal lipomatosis of the colon. The patient's abdominal pain and the pathological findings identified were considered to be unrelated.