Obstructive ileus due to a giant fibroepithelial polyp of the anus

Figure 1 Computed tomography of the pelvis showing the mass in the rectum.

Figure 2 Clinical appearance of the giant fibroepithelial anal polyp. A: The clinical aspect of the mass during surgery; B: The gross macroscopic specimen.

Figure 3 Histological features of the fibroepithelial polyp. A: Photomicrograph of resected polyp showing fibrous tissue covered by squamous epithelium, small vessels and the ulceration of fibrous stroma (HE, × 100); B: Deeper layer of the polyp showing scattered smooth muscle fibers within the fibrous stroma (HE, × 100).

Figure 4 Immunohistochemical analysis of the polyp. A: Stromal cells strongly express SMA; B: Stromal cells strongly express desmin; C: Stromal cells strongly express CD34.