Findings, case of 84 y/o man, rectal bleeding

Imaging Findings

Supine and upright radiographs of the abdomen were normal.

Dynamic scintigraphy of the abdomen following the intravenous injection of Tc-99m labelled red blood cells (Dynamic GI Bleeding Scan) shows a collection of radioactivity in the left side of the pelvis (focal increased uptake) indicating bleeding in the sigmoid region (arrow).

Selective inferior mesenteric angiogram shows extravasation of contrast in the left side of the pelvis, in the region of sigmoid colon, demonstrating the bleeding site (arrow).

Transcatheter vasopressin infusion into the inferior mesenteric artery caused cessation of the bleeding. A repeat angiogram did not show extravasation of the contrast.

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