Cap Polyposis: An Elusive Diagnosis in a Pediatric Patient Successfully Managed With Endoscopic Treatment.

Cap polyposis is a rare condition of the rectum or sigmoid colon manifested by inflammatory polyps covered by a thick layer of fibrinopurulent mucus. This condition typically presents as mucoid diarrhea and rectal bleeding, and patients are often prescribed antibiotics (such as those for Helicobacter pylori), steroids, infliximab, or aminosalicylates. Surgical management is an option for unresponsive disease, but endoscopic management has been rarely reported. For cases of cap polyposis in which conservative medical management fails, wide-field endoscopic mucosal resection is a viable option.