Management of Ileus Identified on CT Scan

Initial Assessment and Differentiation

• The American College of Radiology recommends CT with IV contrast as the primary imaging modality for distinguishing between ileus and mechanical obstruction, with an accuracy of over 90% 1, 2
• Mechanical obstruction is indicated by a clear transition point from dilated to decompressed bowel, "beak sign," "small bowel feces sign," mesenteric edema, bowel wall thickening, and fat stranding 1

Monitoring for Complications

• The World Journal of Emergency Surgery suggests performing serial abdominal examinations to detect development of peritoneal signs, which indicate perforation or ischemia requiring urgent surgery 3, 1
• Monitor for progression of symptoms despite conservative management, and consider urgent surgical consultation if peritoneal signs develop, or if CT demonstrates ischemia, perforation, or closed-loop obstruction 1

Special Considerations

• The World Journal of Emergency Surgery recommends considering water-soluble contrast challenge if diagnosis remains uncertain between partial obstruction and ileus, with caution to ensure adequate gastric decompression first to avoid aspiration 4, 2
• If contrast reaches colon within 24 hours, this predicts successful non-operative management 2

Common Pitfalls to Avoid

• The Journal of the National Comprehensive Cancer Network advises against administering prokinetic agents if complete obstruction cannot be excluded, as this may cause perforation 5
• The American College of Radiology recommends avoiding administration of oral contrast in high-grade obstruction due to aspiration risk 1