Colorectal neuroendocrine carcinoma: A case report and review of the literature

Figure 1 Imaging findings. A: Contrast-enhanced computed tomography (CT) of the abdomen shows an irregularly shaped and enhanced mass (10 cm) at the right colonic flexure. White arrow indicates the tumor; B: CT showed multiple low-density tumors in the liver with no enhancement effect. Black arrows indicate the tumors; C: Colonic enema with water-soluble contrast medium (Gatrografin^®) shows an irregular shape in the lumen of colon. Black arrow indicates the stenotic and irregular lesion; D: Colonoscopy showed the mass in the right transverse colon with significant stenosis due to submucosal elevation of the tumor. Black arrow indicates the submucosal elevation; E: Colonoscopy showed the necrotic tissue in the lumen of the tumor. White arrow indicates the necrotic lesion; F: Perforation of the colon by stenting. Black arrow indicates the free-air and intratumoral air outside the stent.