Abstract
Aneurysm of a major aortopulmonary collateral artery (MAPCA) is quite rare. Aneurysmally dilated MAPCA may be complicated with rupture and massive hemoptysis leading to sudden death. Possible pathophysiology for aneurysm formation is persistent high pressure state in collateral circulation. High index of suspicion is necessary to avoid catastrophic complications as the amount of hemoptysis does not correlate with disease severity and etiology. We present a case of large ruptured aneurysm of a MAPCA presenting with massive haemoptysis in a patient of cyanotic congenital heart disease which was salvaged by endovascular deployment of vascular plug.
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