Omphalomesenteric Duct and Urachal Remnants

Omphalomesenteric duct and urachus are two transitory structures, normally encountered during the embryonic development. The first usually disappears by the fifth to seventh week of gestation, while the urachus progressively narrows and is obliterated by fibrous proliferation during the fetal life. Remnants of these embryonic structures account for a wide variety of abnormalities that may require surgical correction.