Fig. 2From: Diffuse large B-cell lymphoma originating from the rectum and diagnosed after rectal perforation during the treatment of ulcerative colitis: a case reportPreoperative CT findings. Abdominal CT scan showing intraperitoneal free air and colon distension, suspicious of gastrointestinal perforation (a). Pelvic CT scan showing the perforation site in the rectum but does not clearly reveal the presence of the lymphoma (b)Back to article page