Fig. 3From: Reversible rituximab-induced rectal Kaposi’s sarcoma misdiagnosed as ulcerative colitis in a patient with HIV-negative follicular lymphomaColonoscopy imaging. Colonoscopy of June 2016 showing sigmoiditis, with a 4-mm-depth rectal ulceration (black arrow) at 20 cm of the anal canal, compatible with ulcerative colitisBack to article page