[Cardiac arrest in a teenager - a case report].

Cardiac arrest is rarely seen in children and teenagers. We present a 12-year old girl with cardiac arrest following myocardial infarction, that required prolonged cardiac massage and extracorporeal-membranous-oxygenation (ECMO). At coronary angiography the left main coronary artery (LMCA) was stented for a suspected coronary dissection. The contraction of the heart improved and the ECMO-treatment was discontinued a week later. The patient was discharged home, but six months later a coronary artery bypass surgery was performed for in-stent restenosis. Further work-up with computed tomography (CT) showed that the LMCA originated from the right aortic sinus instead of the the left one. This case demonstrates how life threatening myocardial infarction can be caused by coronary artery anomalies.