Technetium labeled red blood cell scan

A technetium labeled red blood cell scan from a 63-year-old patient with a 24-hour history of bright red blood per rectum reveals increased activity in the distal transverse colon near the splenic flexure (arrow) which progresses toward the descending colon and sigmoid colon by termination of the examination at one hour. These findings are consistent with bleeding from a source in the distal transverse colon near the splenic flexure.