Pulmonary artery aneurysm is a rare disorder, with the underlying pathology remaining obscure in many instances. More common causes include pulmonary hypertension, poststenotic dilation, or vasculitis. In this case series, we report 3 patients presenting with isolated pulmonary artery aneurysms in whom multimodality imaging revealed the dysgenesia of a single pulmonary valve cusp as the cause of the huge pulmonary aneurysm.
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