Colon cancer arising from colonic diverticulum: A case report

Figure 1 Preoperative computed tomography, magnetic resonance imaging, and gastrografin enema examination. A: The inflammatory changes around the intestinal tract continue to the left bladder wall, and the bladder wall is slightly thickened. Tumor cannot be seen; B: A penetrating portion continuous with the sigmoid colon is visible on the upper left side wall of the bladder; C: Only a diverticulum is found in the sigmoid colon.

Figure 2 Intraoperative findings. A portion of the fistula with the sigmoid colon is observed on the upper left side of the bladder wall.

Figure 3 Histopathological examination findings. A, B: Macroscopically, several diverticulum are visible in the colonic lumen, but tumorous lesions around the fistula are not observed; C: Histologically, there is tumor characterized by mild exophytic papillary growth (arrowheads) along the diverticular lumen (arrows). It was diagnosed as well-differentiated adenocarcinoma (HE staining, × 100).

Figure 4 Computed tomography one and a half years after surgery. A tumor lesion about 1 cm in size is seen in the bladder wall.