Severe Congenital Obstruction of the Left Main Coronary Artery Coexisting With Supravalvular Aortic Stenosis in Williams Syndrome: A Dangerous Association.

Congenital obstruction of the left main coronary artery is a complicating feature of supravalvular aortic stenosis. We describe an eight-month-old female patient with Williams syndrome, supravalvular aortic stenosis, and branch pulmonary artery stenosis, with concomitant anomaly of severe obstruction of the left coronary artery orifice.