Hemobilia detected by Tc-99m labeled red blood cells.

Tc-99m labeled red blood cells were successfully used to determine the site of hemorrhage in a 67-year-old man with hemobilia. A false hepatic artery aneurysm was confirmed at angiography and ultimately successfully embolized. The relative merits of using Tc-99m labeled red blood cells for detecting sources of upper gastrointestinal bleeding are discussed.