Supravalvar aortic stenosis.

one manifestation of the idiopathic hypercalcaemia of infancy syndrome, and the possible aetiologies are discussed. Another presentation of supravalvar aortic stenosis is in the so-called familialform, but there may exist considerable confusion between these two forms, as less than 50 per cent of those without physical stigmata have a positive family history, and the severeform of the idiopathic hypercalcaemia of infancy syndrome presenting with supravalvar aortic stenosis may have intermediate, or even normal facies. Management depends largely on the severity of the outflow tract obstruction. Full classification may be delayed until the aetiology is completely understood.