Cytomegalovirus (CMV) colitis has been reported infrequently in patien
ts with underlying inflammatory bower disease, and usually in those wh
o are taking long-term corticosteroid drugs and who are potentially im
munosuppressed. We report a 39-year-old man with longstanding ulcerati
ve colitis, taking only sulfasalazine, who developed a viral prodrome
followed by bloody diarrhea. Severe colitis was noted on endoscopy. He
worsened with intravenous steroid and antibiotic drugs. Flexible sigm
oidoscopy with biopsy before a contemplated colectomy revealed a moder
ately active colitis with large cells containing intranuclear inclusio
ns scattered throughout the biopsies, characteristic of CMV colitis. S
erologic and immunologic studies suggested recent CMV infection. The p
atient improved with intravenous ganciclovir and a steroid taper, and
colectomy was avoided. CMV colitis is a potentially treatable cause of
fulminant colitis.