Abstract
A 19-year-old woman presented to the emergency department with arrhythmia and signs of cardiogenic shock. After a 12-lead electrocardiogram ruled out acute myocardial infarction, and cardiac magnetic resonance showed no sign of cardiomyopathy, cardiac computed tomography angiography (CCTA) was performed, displaying ostial atresia of the right coronary artery. She was thus referred to a specialist centre for congenital cardiovascular disease, where an electrophysiological study observed an arrhythmogenic focus on the posteromedial papillary muscle, which was ablated, and she has been asymptomatic since. When dealing with patients presenting with arrhythmias or cardiogenic shock, and no signs of myocardial infarction or cardiomyopathy, performing CCTA to study the anatomy of the coronary arteries is vital.