Abstract
The development of hemodynamically significant muscular subaortic stenosis in association with pulmonary artery banding is described in one patient with D-transposition of the great arteries, and another with interrupted aortic arch. It is postulated from these and previously reported cases that hypertrophy of the conal septum (crista supraventricularis), whether subpulmonary or subaortic, congenitally displaced or grossly normal, may follow pulmonary artery banding and result in progressive subaortic outflow obstruction. Surgical repair may require resection of conal musculature.
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