Collateral circulation in normal coronary arteries

A 64-year-old woman referred with a 4-month history of intractable chest pain. Coronary angiography was performed and showed normal left coronary arteries. Posterior descending coronary artery was filled via distal left circumflex artery. The right coronary artery injection showed prompt filling of the distal circumflex through prominent collaterals. There was no evidence of proximal obstructive disease or spasm. We present a case in which a large collateral artery was seen in angiographically normal coronary arteries