Tetralogy of Fallot Christa Faschingbauer, MD Article Published: Aug 22, 2006 Germany This is a 42-year-old-woman, G4P4 (one set of twin) with a fetus with Tetralogy of Fallot and a single umbilical artery at 20 weeks. The karyotype was normal (46XX). Note the overriding of the aorta and the smaller pulmonary artery. Discussion Board Start a discussion about this article Add to Favorites Favorite