Three cases of interrupted aortic arch of type A (IAA, type A) identified on prenatal ultrasound examination
are presented. IAA, type A was a component of 22q11.2 microdeletion syndrome, established by molecular
analysis of the aborted fetus`s tissues in the first case and a part of trisomy 13 in the second one. In the third fetus
with a normal karyotype, IAA, type A was diagnosed at 31 weeks of gestation and successful cardiac surgery was
performed after birth. In a fetus with 22q11.2 microdeletion syndrome, IAA was combined with ascending aorta
hypoplasia and ventricular septal defect. In fetuses with Patau syndrome and normal karyotype IAA type A was
accompanied by an aortopulmonary window.