Idiopathic myointimal hyperplasia of mesenteric veins mimicking steroid-refractory ulcerative colitis: A case report

Figure 1 Initial colonoscopic findings. Colonoscopy at presentation revealed continuous mucosal inflammation characterized by edema, erythema, and friability extending from the transverse colon through the descending and sigmoid colon to the rectum. No definite deep ulceration was identified, and a relatively sharp demarcation from adjacent normal mucosa was noted at the proximal extent of involvement. A: Transverse colon; B: Descending colon; C: Sigmoid colon; D: Rectum.