Colonic lymphoma is a rare complication of ulcerative colitis. We repo
rt two cases of B cell colonic lymphoma occurring in two patients who
had a left-sided ulcerative colitis for 7 and 24 years respectively. T
he diagnosis was made during surgery in one case and at colonoscopy in
the other. Complete remission was achieved after surgery and chemothe
rapy with a 8-year and 15-month follow-up respectively.