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Usual diagnostic modalities to detect the source of acute lower gastrointestinal bleeding (colonoscopy, scintigraphy with technetium-labeled red cells, and invasive angiography) have limitations. In this prospective study, researchers examined the accuracy of computed tomography (CT) angiography in 47 patients who presented to an emergency department in Spain with acute lower gastrointestinal bleeding deemed severe enough to warrant urgent evaluation by colonoscopy, scintigraphy, or invasive angiography; the reference standard consisted of these modalities or surgery findings. CT was considered to be positive when it demonstrated intraluminal contrast enhanced–material consistent with blood.
CT angiography depicted the presence and location …