2024年11月16日 · Sigmoid volvulus is a cause of large bowel obstruction and occurs when the sigmoid colon twists on its mesentery, the sigmoid mesocolon. Large bowel volvulus accounts for ~5% of all large bowel obstructions, with ~60% of intestinal volvulus involving the sigmoid colon 6. It is more common in the elderly 7.

Three radiologists evaluated scanograms and cross-sectional images for several classic and two novel imaging signs of volvulus: crossing sigmoid transitions (called the X-marks-the-spot sign) and folding of the sigmoid wall by partial twisting (called the split-wall sign). A general impression was assigned to scanograms and cross-sectional images.

Three radiologists evaluated scanograms and cross-sectional imag-es for several classic and two novel imaging signs of volvulus: crossing sigmoid transitions (called the X-marks-the-spot sign) and folding of the sigmoid wall by partial twisting (called the split-wall sign). A general impression was assigned to scanograms and cross-sectional images.

Sigmoid volvulus is a major cause of intestinal obstruction, mostly seen in the elderly. 60% of intestinal volvulus involve the sigmoid colon. Multiple signs of sigmoid volvulus are seen in abdominal X-rays and CT scans.

2015年5月21日 · Sigmoid volvulus is the abnormal twisting of the sigmoid colon along the mesenteric axis, which leads to a closed-loop obstruction. The diagnosis of sigmoid volvulus is evident on abdominal radiographs in 57%–90% of cases ( 40 – 42 ).

2020年2月1日 · Sigmoid volvulus is the third most common cause of bowel obstruction after cancer and diverticulitis. 1 Risk factors include chronic constipation, diabetes mellitus, neurologic disorders, and previous abdominal surgery. 2 The classic clinical presentation is a triad of abdominal pain, distention, and constipation. 3.

A typical sigmoid volvulus (SV) in a 51-year-old woman. (a) Coronal CT slice showing a typical SV and severity signs: dilated loop (*), rectum filled with contrast enema (+) and fully infiltrated mesosigmoid (arrowhead), which can be compared with normal mesentery (double arrowhead).

Three radiologists evaluated scanograms and cross-sectional images for several classic and two novel imaging signs of volvulus: crossing sigmoid transitions (called the X-marks-the-spot sign) and folding of the sigmoid wall by partial twisting (called the split-wall sign).

Markedly dilated sigmoid colon reaching the right hypochondrial region showing coffee bean sign, tapering of its lower end (bird beak sign with rectal contrast) and whirly appearance of its mesentery. No underlying mural thickening noted.

2023年6月2日 · The definitive diagnosis requires a CT abdomen-pelvis scan with intravenous contrast. CT imaging will demonstrate a very dilated sigmoid colon with an associated “whirl sign” (Fig. 3), where the twist within the mesentery is visualised around its base. CT imaging is useful to also assess for any radiological evidence of bowel ischaemia.