 Coronary artery aneurysm is defined as coronary dilatation which exceeds the diameter of normal adjacent segments or the diameter of the patients largest coronary vessel by 1.5 times. Described by Bourgon, it is an uncommon disease which has been diagnosed with increasing frequency since the advent of coronary angiography. The incidence varies from 1.5 to 5 with male dominance and a predilection for the right coronary artery. 