A 40 year old male, a known case of hypertrophic cardiomyopathy, was admitted for catheterization. At catheterization and angiography, septum was hypertrophied to about 5cm and diffuse coronary artery aneurysm was revealed. We found no previous report of coronary artery aneurysm in hypertrophic cardiomyopathy.

giant aneurysm of the RCA was confirmed during surgery (Figure 3A). After incision, significant thrombus was removed. Both proximal and distal ends of the aneurysm (Figure 3B) were ligated after bypassing the posterior descending artery. Two additional bypass grafts (LAD and OM) were performed and the postoperative course was uneventful. The macroscopic specimen removed from the RCA aneurysm, m...