The sigmoid colon is articulated to the descending colon, on the right side of the human abdominal wall, with the rectum and anal canal in the lower section. So when the torsion occurs, it is a 90-degree torsion that occurs with its mesentery as the central axis, and when the X-ray flat film is irradiated, it will be found that the whole abdominal cavity becomes a horseshoe-shaped double-lumen inflatable intestinal tripping, which is expanding from the right to the left, and it can be found that there are two planes of fluid: one is the closed intestinal collaterals; the other is the dilated ileocecal portion. If you do a barium enema, at this point you can see the barium host at the site of the torsion, and the tip of the shadow shows the shape of a bird’s beak, which is called a bird’s beak in the middle. Torsion of the sigmoid colon is mostly secondary to the redundancy of the sigmoid colon, especially in the elderly with a long history of constipation. The period of discovery if earlier, early in the colonoscopy, the anal canal through the torsion site for decompression, if found strangulation, does not rule out the case of intestinal necrosis, the need to do timely surgical treatment.