Inflammatory rectal polyp with osseous metaplasia

To present a rare case of osseous metaplasia in an inflammatory rectal polyp. A 9-year-old boy admitted to the clinic with a 6 month history of intermittent rectal bleeding that occurred approximately 15 times. An 8 mm polyp in diameter was totally excised from rectal wall. Histologically, elongated, dilated, mucin filled colonic glands were scattered within stroma which was composed of both acute and chronic inflammatory and granu-lation tissue. In the stroma there was a small focus of new bone formation, which was covered with intact colonic mucosa. We presented an extremely rare case report of a metaplastic bone formation in a rectal inflammatory polyp.