Rare synchronous colorectal carcinoma with three pathological subtypes: A case report and review of the literature

Figure 1 Computed tomography images. A: Abdominal computed tomography (CT) revealed intestinal stenosis in the splenic flexure of the colon (arrow); B: Abdominal CT revealed obvious bowel wall thickness in the lower portions of the rectum (arrow); C and D: Axial and sagittal magnetic resonance imaging of the rectum depicted a sign of concentric tumor rings within the rectal wall and a tumor penetrating the layer of the intrinsic muscle into the perirectal mesenteric fat (arrow).