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.

A radiograph can often suggest the presence of sigmoid volvulus; however, a CT scan may be necessary if bowel ischemia is suspected or if rectal decompression has failed, as it can help identify other associated complications.

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).

Sigmoid volvulus is the most common type of colonic volvulus and occurs when a portion of the intestine twists around its blood supply. In sigmoid volvulus, this occurs at the base of the mesentery. It most commonly presents in patients who are bedbound and have a history of chronic constipation.

Sigmoid volvulus is an abnormal twisting of the sigmoid colon along its mesenteric axis that causes closed-loop obstruction and can lead to ischemia, perforation, and death.

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).

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 ).

2021年3月16日 · Sigmoid volvulus and acute colonic pseudo-obstruction (ACPO) have similar presentations, and cross-sectional imaging with CT can be used to differentiate between them. ACPO findings include...