Congenital gastric outlet obstruction is a rare condition representing only 1% of all gastrointestinal atresias. Prenatal diagnosis is uncommon and mostly confined to the third trimester of cases presenting a combination of polyhydramnios with dilated stomach. We report a case of congenital gastric outlet obstruction by pyloric membrane which was diagnosed prenatally in the third trimester by sonography and magnetic resonance imaging. The anomaly appeared to be isolated, thus a favorable outcome was expected. A baby girl weighing 3,430 g was delivered spontaneously at 36 weeks. Postnatal imaging methods confirmed the presence of a congenital gastric obstruction. 21 h after delivery, the baby underwent laparotomy, at which time a malrotation and pyloric membrane were found and resolved. The postoperative course was uneventful and the baby was discharged at the age of 18 days and remains well at controls.

Department of Imaging Methods Charles University 2nd Faculty of Medicine and Faculty Hospital Motol Prague Czech Republic

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