Fig. 2
The computerized tomography (CT) image before surgery and surgical specimens of case 3 and case 4. a, b CT image of case 3, c, d CT image of case 4; the red arrows show the bladders are invaded by tumor; the white arrows show the air bubbles in the bladder because of rectovesical fistula; e, f the specimen of case 3, g, h the specimen of case 4 (the black arrows show the same results to the radiographic results)