Ectopic liver within the umbilical cord in a very preterm infant from a multiple gestation.

A 29 weeks' gestational age newborn, the product of a multiple gestation, was found to have a round mass in the umbilical cord; the resected lesion was an ectopic liver tissue (3 × 2 cm). She also had an imperforated hymen; otherwise, no other abnormalities were seen. The infant survived. Some possible mechanisms that may be associated with an ectopic liver tissue are presented.