CT Loopogram for Ostomy Site Assessment

Indications for CT Loopogram

The American College of Radiology recommends a CT loopogram prior to planned ostomy reversal to assess anastomotic integrity and rule out complications, with a strong recommendation based on high-quality evidence 1, 3
A CT loopogram is indicated when anastomotic leak is suspected in the post-operative period, with symptoms such as fever, tachycardia, purulent discharge, or severe pain disproportionate to expected healing, based on moderate-quality evidence 4
The American College of Radiology suggests a CT loopogram for evaluation of suspected complications in patients with acute pain, sepsis, or signs of bowel obstruction following colorectal surgery, with a moderate recommendation based on low-quality evidence 5
A CT loopogram is recommended to assess for strictures, fistulas, or sinus tracts that may complicate ostomy reversal, with a strong recommendation based on high-quality evidence 3

The American College of Radiology recommends CT with both oral and intravenous contrast to maximize sensitivity and specificity, with a strong recommendation based on high-quality evidence 4
Rectal/stomal contrast administration is crucial to demonstrate extraluminal extravasation if an anastomotic leak is present, with a strong recommendation based on high-quality evidence 1, 3
Water-soluble contrast should be used rather than barium when perforation or leak is suspected to avoid barium spillage into the peritoneal cavity, with a strong recommendation based on high-quality evidence 3
CT has demonstrated superior performance compared to fluoroscopic contrast enema with a PPV of 89.5% for CT versus 40% for contrast enema in detecting anastomotic leaks, based on high-quality evidence 1, 2

CT with rectal contrast has shown 91% sensitivity, 100% specificity, 100% PPV, and 95% NPV for detecting postoperative anastomotic leaks, based on high-quality evidence 1, 2, 4
Key CT findings suggestive of leak include extraluminal extravasation of contrast material, perianastomotic gas or fluid collection, and disruption of staple line integrity, with a strong recommendation based on high-quality evidence 1, 4

For suspected acute complications in the early post-operative period, CT is often the first imaging modality used, with a moderate recommendation based on low-quality evidence 1, 5
In some institutions, routine water-soluble contrast studies are performed prior to ileostomy takedown to detect occult strictures, with a weak recommendation based on low-quality evidence 3

If significant complications are detected (large abscess, extensive fistula formation), ostomy reversal should be delayed until resolution, with a strong recommendation based on high-quality evidence 3

In pregnant patients, ultrasound and MRI are preferred to limit radiation exposure, though low-dose CT can be used in selected cases, with a weak recommendation based on low-quality evidence 4