An 11-month-old boy came to medical attention after a heart murmur was detected during a routine physical examination. He was referred to our institution for evaluation of abnormal chest roentgenographic findings (Fig 1). The pregnancy and perinatal course were normal and the patient had no history of cyanosis or serious childhood illness. At presentation the boy had developed normally and was active and acyanotic. A ventilation-perfusion scan (Fig 2) and a right ventriculogram (Fig 3) were obtained.
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