Tight obtuse marginal (OM) Lesion – right anterior oblique (RAO) caudal view
Left coronary angiogram in right anterior oblique (RAO) caudal view, showing a tight lesion in the obtuse marginal (OM) branch of the left circumflex (LCX) coronary artery. LAD: left anterior descending coronary artery. The OM lesion is marked by the light cyan arrow and is seen in the proximal portion of the obtuse marginal, which is a major branch of the left circumflex. The angiographic catheter tip is seen in the left main coronary artery.