Lower gastrointestinal bleeding CT scan

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Aditya Ganti M.B.B.S. [2]

CT scan

Helical CT scanning of the abdomen and pelvis is employed used when a routine workup fails to determine the cause of active gastrointestinal bleeding. Helical CT scanning is a safe, convenient, and an accurate diagnostic tool relative to mesenteric angiography and colonoscopy in diagnosing acute lower GI bleeding (LGIB). Findings of helical CT scan in lower gastrointestinal bleeding include:

• Vascular extravasation of the contrast medium
• Contrast enhancement of the bowel wall
• Thickening of the bowel wall
• Spontaneous hyperdensity of the peri-bowel fat, and vascular dilatations.

Multidetector-row CT (MDCT) scanning is also useful in the evaluation of LGIB.

Sensitivity	MDCT	Endoscopy
Site	100%	88.2%
Etiology	52.9%	52.9%