Giant coronary artery aneurysms (GCAAs) are rare cardiovascular malformations that necessitate a multimodal, interdisciplinary diagnostic and individualized interventional approach. This report describes the case of a young, healthy patient with an idiopathic GCAA with pseudoaneurysmal protrusion into the right atrium that caused syncope, cardiac decompensation, and arrhythmia, which subsided postoperatively.
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