Fig. 1Initial abdominal computed tomographic scan from an outside hospital showing the target sign in the left mid to lower abdomen.
Fig. 2Colonoscopic finding showing a large, smooth-surfaced, round mass lesion, mimicking a submucosal tumor, near the hepatic flexure.
Fig. 3Follow-up abdomen computed tomographic (CT) scan. Comparing to the previous CT scan, the large high-density mass had moved to the right side of the abdomen, suggesting an ascending colonic mass.
Fig. 4Pathophysiology. Panel A shows a large diverticulum in the gross specimen. Panel B exhibits the true diverticulum and shows the full thickness of the bowel wall from the mucosa to the serosa in a low-power field (H&E, × 100). The white arrow indicates an outpouching of the diverticulum. Panel C shows amorphous materials, consistent with a fecalith, in the diverticular lumen (H&E, × 100).