Abstract 16257: Giant Left Circumflex (LCx) Coronary Artery Aneurysm (CAA) Presenting as a Cardiac Mass
Introduction: CAAs are a rare but potentially life-threatening condition. Commonly defined as localized dilations greater than 1.5 times the adjacent artery, “giant” CAA (GCAA) is a term used to describe CAAs that have progressed to greater than four times the adjacent artery. Case: A 73-year-old male who presented with acute dyspnea was found to have a 4.5cm epicardial mass on computed tomography angiography (CTA) of the chest. Coronary angiography revealed a large partially thrombosed saccular aneurysm of the proximal LCx with diffuse ectasia of the remaining coronary arteries. He underwent percutaneous coronary intervention (PCI) with the placement of a covered stent from the left anterior descending to the left main artery, traversing and effectively occluding the LCx. He tolerated the procedure and was discharged on clopidogrel and apixaban. Discussion: Due to their insidious nature, CAAs are underdiagnosed and progress undetected. Serious complications include aneurysm rupture and fistula formation. CAAs are most commonly caused by atherosclerosis but have been associated with infectious, rheumatologic, and genetic etiologies. Drug-eluting stents are increasingly implicated in CAAs by the mechanism of direct vessel trauma and drug-induced inhibition of smooth muscle proliferation. The optimal management of CAAs remains unclear. Cardiovascular risk reduction and monitoring are recommended. Invasive management is usually reserved for giant or unstable aneurysms. Surgical resection or repair is conventional but percutaneous methods such as coiling and stent occlusion are increasingly utilized. Our patient underwent a successful vessel and aneurysm occlusion with favorable post-PCI outcomes. Conclusion: GCAAs are extremely rare and understudied. Percutaneous management appears effective in the management of GCAAs, but the study of long-term safety and outcomes is required.