Dissecting aneurysm of coronary artery presenting as cardiac tamponade.

Primary dissecting aneurysm of the coronary arteries usually presents as sudden death or complications of myocardial infarction. The most common site of the dissection has been the anterior descending branch of the left coronary artery. A Chinese woman with primary dissecting aneurysm of the right coronary artery presenting as cardiac tamponade is reported. This is the first case of ruptured coronary aneurysm reported in the Chinese and the only case presenting as cardiac tamponade since 1931.