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Left posterior oblique (LPO) position is to view the sigmoid colon without overlapping of other bowels. [1] Hampton's view (prone caudal view) of rectosigmoid colon is taken when the subject is in prone position with the X-ray tube tilted towards the feet at 30 degrees. This is to separate out the loops of sigmoid colon. [2]
Sigmoidectomy is a resection of the last part of the colon, known as the sigmoid colon, and can include part or all of the rectum (proctosigmoidectomy). Precancerous polyps and sigmoid colon cancer are common indications for sigmoidectomy.
Strictures are often treated observantly; they may heal spontaneously over 12–24 months. If a bowel obstruction develops as a result of the stricture, surgical resection is the usual treatment, [36] although endoscopic dilatation and stenting have also been employed. [37] [38]
An objective method used to evaluate the motility of the colon and help with diagnosis is the colon transit time. [19] Another helpful test to diagnose this condition may be an abdominal X-ray as this can show the distribution of the faeces and show any abnormalities with the colon, for example a megacolon . [ 14 ]
Computed tomography of the abdomen is not routinely necessary, but may show thickening or inflammation in the distal colon (sigmoid colon) with associated diverticulosis. Treatment may consist of antibiotics, aminosalicylates (mesalamine), or prednisone. In rare cases, surgery with segmental resection may be considered.
Proctoscopy, or rectoscopy, is a common medical procedure in which an instrument called a proctoscope (also known as a rectoscope, although the latter may be a bit longer) is used to examine the anal cavity, rectum, or sigmoid colon. A proctoscope is a short, straight, rigid, hollow metal tube, and usually has a small light bulb mounted at the end.
Placement of the stoma on the abdomen can occur at any location along the colon, but the most common placement is on the lower left side near the sigmoid where a majority of colon cancers occur. Other locations include the ascending, transverse, and descending sections of the colon. [4]
The sigmoid colon is completely surrounded by peritoneum (and thus is not retroperitoneal), which forms a mesentery (sigmoid mesocolon), which diminishes in length from the center toward the ends of the loop, where it disappears, so that the loop is fixed at its junctions with the iliac colon and rectum, but enjoys a considerable range of movement in its central portion.