Sigmoidorectal intussusception of adenoma of sigmoid colon treated by laparoscopic anterior resection after sponge-on-the-stick-assisted manual reduction

Figure 1 Endoscopic findings. A: Flexible sigmoidoscopy at a local clinic showing the mass lesion 15 cm from the anal verge, and the partial downward displacement of involved bowel (arrow); B: Colonoscopy at our clinic showing the invaginated bowel with a round mass lesion about 3 cm from the anal verge.

Figure 2 Contrast enhanced CT scan of pelvis showing a homogenously well enhancing mass at the intussuscepted bowel tip.

Figure 3 Gastrograffin study showing a large smooth-invaginated mass intussuscepting into the rectum.

Figure 4 Hematoxylin and eosin staining of the lesions. A: The polypoid mass of the colon showing branching papillary projections composed of proliferated glands and thin fibrous stalks (× 10); B: The proliferated glands of the polyp (left) lined by single or pseudostratified hyperchromatic columnar cells as compared with normal colonic mucosa (right), but without any malignant changes (× 40).