Fifteen-year-old colon cancer patient with a 10-year history of ulcerative colitis

Figure 1 Preoperative computed tomography. A: Enhanced protruding polypoid mass at the sigmoid colon; B: diffuse colonic wall thickening with loss of haustra (“lead pipe appearance”).

Figure 2 Colonoscopy findings. A: Diffuse granular lesions; B: Multiple ulcerations from the transverse colon to the rectum; C: A polypoid mass at the sigmoid colon.

Figure 3 Gross appearance of the colon. A: There was a 5 cm × 3 cm-sized polypoid mass at the sigmoid colon; B: There was severe nodularity with fibrosis in the whole colon.