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The clinical findings and course in 10 HIV-positive patients with cytomegalovirus (CMV) colitis were analyzed. Homosexuality was the main risk factor for HIV infection. All patients had markedly reduced CD4 counts (mean 25 x 10(9)/l). Symptoms at presentation were chronic diarrhea, weight loss, fever and abdominal pain. One of the patients had an abdominal mass in the ileocecal region due to inflammation as the leading symptom. Endoscopically the colitis was more often segmental than diffuse. In 2 out of 9 patients who underwent colonoscopy, only the right hemicolon was affected. Concurrent intestinal infections with up to 4 different pathogens were found in 7 patients. 5 patients had chorioretinitis as an extraintestinal CMV symptom (2 before, 3 after the occurrence of CMV-colitis). In only one patient was there a partial response of CMV-colitis to therapy with ganciclovir and foscarnet. Even under therapy CMV colitis was complicated in 2 patients by perforation and inflammatory stenosis respectively. Both needed surgical treatment. Most of the patients died of generalized CMV infection or wasting syndrome.