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

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.