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A 6-year-old boy, with no relevant medical history, was seen for recurrent dyspnoea and wheezing. He was found to have a systolic heart murmur. An echocardiogram showed a circular anechogenic image posterior to, and to the left of, the ascending aorta, compressing the pulmonary trunk and right pulmonary artery, with systolic flow into the lesion.
An MRI and multidetector helical CT scan …