Solitary interruption of the aortic arch with stenotic origin of the left subclavian artery in 45, XO/46, XY/47, XYY mosaicism.

A four-year-old boy whose karyotype was 45, XO/46, XY/47, XYY mosaicism was diagnosed as having interruption of the aortic arch without ventricular septal defect or patent ductus arteriosus, complicated by stenotic origin of the left subclavian artery, which resembled coarctation of the aorta hemodynamically. Solitary interruption of the aortic arch is a very rare anomaly.