Cholecystocolic fistula caused by gallbladder carcinoma: Preoperatively misdiagnosed as hepatic colon carcinoma

Figure 1 Preoperative colonoscopy showed a diverticulum with an embedded, laterally spreading tumor-like lesion at the hepatic flexure colon.

Figure 2 Macroscopic appearance of the cholecystocolic fistula.

Figure 3 Adenocarcinoma of the gallbladder. A: Gross appearance of the resected gallbladder; B: Adenocarcinoma of the gallbladder (HE, × 200).

Figure 4 Contrast enhanced computed tomography images. A: Axial computed tomography (CT) showed air-filled appearance of gallbladder along with thickening of the wall and well defined margin between the liver and the gallbladder (white arrow); B: Coronal CT showed the fistulous tract between gallbladder and hepatic flexure colon (white arrow), and pneumobilia.