Antenatally diagnosed congenital pyloric duplication associated with intraluminal pyloric cyst--rare entity case report and review of the literature.

Duplication of the digestive tract is a very rare malformation in children whereas the congenital pyloric duplication is extremely rare, few cases being described in the literature. We present the case of a male infant, aged seven days, who was diagnosed at 17 weeks of gestation with a cystic mass in the abdomen and who presented vomiting in the sixth day of life. Ultrasound and CT diagnosed a pyloric duplication cyst. The malformation was visualized intraoperatively and removed successfully without incidents. The infant's postoperative evolution was excellent, with an upward weight curve without a dumping syndrome. Finally, we present a review of the published cases of congenital pyloric duplications in the world, this one being the fifth one reported of the prenatally diagnosed cases.