Typhoid colitis with massive lower gastrointestinal bleeding. An unexpected behavior of Salmonella typhi.

Three cases of salmonella colitis with massive lower gastrointestinal hemorrhage are presented. The patients had fever, diarrhea, and abundant hematochezia; blood and bone marrow cultures were positive for Salmonella typhi. Because of bleeding, all patients underwent hemicolectomy; previous mesenteric arteriograms showed the colonic hemorrhagic sites. The pathologic and radiologic findings are described.