Treatment of acute severe ulcerative colitis using accelerated infliximab regimen based on infliximab trough level: A case report

Figure 2 Flexible sigmoidoscopy performed during hospitalization. A-D: Endoscopic image showing ulcers covered by fibrin, friability, edema and marked enanthem with spontaneous bleeding in sigmoid (A and B) and rectum (C and D), consistent with the ulcerative colitis of severe activity (Mayo endoscopic score 3).