Umbilical polyp: a report of two cases.

Two cases with umbilical polyp are reported. This rare malformation arises from remnants of the omphalomesenteric duct and may be clinically mistaken for a granuloma pyogenicum or other benign or malignant umbilical neoplasms. Histologically umbilical polyp shows branching glandular structures lined by intestinal mucosa in connection with the surface of the skin. When the umbilical polyp is not associated with any other types of underlying abnormalities, it may be treated by a simple surgical excision.