A 63-year-old female who had been diagnosed as rheumatoid arthritis (RA) for 17 years, admitted to our hospital because of low grade fever and severe bloody diarrhea. Barium enema and colonoscopic examination revealed colonic pseudopolyposis and disappearance of Haustra coli. The pathological finding showed inflammatory changes which were compatible with ulcerative colitis (UC) .
While RA was well controlled by oral administration of prednisolone, remission of UC could be obtained by increasing dosage of oral administration of prednisolone and sulfasalazopyridine.
UC is a rare complication of RA. But on the course of RA, when anemia or severe diarrhea was detected, colon should be examined to rule out UC.
