A 10-year-old boy presented with a history of exertional chest pain. An ele
ctrocardiogram demonstrated an inferior apical myocardial infarction. Cardi
ac catheterization revealed myocardial bridging of the left anterior descen
ding coronary artery with evidence of intramyocardial obstruction during sy
stole. The patient underwent successful treatment with supraarterial decomp
ression myotomy and remains symptom free at 1 year. (C) 1999 by The Society
of Thoracic Surgeons.