Small bowel obstruction
 Etiologies of adult small bowel obstruction
- The most common cause of small bowel obstruction (SBO) in adults is adhesion (up to 75% of cases), followed by hernias and neoplasm.
- ABCs of SBO:
- A: Adhesions
- B: Bulges (hernias)
- C: Cancer (neoplasm)
- Extrinsic lesions
- Intrinsic lesions
 Diagnosis of small bowel obstruction
- The reported sensitivity of CT in the detection of small bowel obstruction ranges from 78% to 100% for complete or high-grade obstruction.
- Report to the clinicians both the level of obstrucion and the degree of obstruction (i.e. partial or complete).
 Imaging Findings
- Identification of dilated proximal bowel and collapsed distal bowel is diagnostic for bowel obstruction (small bowel with a caliber greater than 2.5 cm is considered dilated).
- If a transition zone between the dilated proximal and collapsed distal bowel is detected, the diagnosis is more certain.
- The "small bowel feces" sign uncommon but reliable indicator of small bowel obstruction. Gas bubbles mixed with particulate matter are observed in dilated small bowel loops proximal to an obstruction.
 See Also
 External Links
- Akira Furukawa, Michio Yamasaki, Kenji Furuichi, Kenji Yokoyama, Tamotsu Nagata, Masashi Takahashi, Kiyoshi Murata, and Tsutomu Sakamoto. Helical CT in the Diagnosis of Small Bowel Obstruction. RadioGraphics 2001 21: 341-355.