PTCA balloon at obtuse marginal (OM) lesion
Left coronary angiogram (partially filled frame) showing PTCA (percutaneous transluminal coronary angioplasty) balloon positioned at a lesion in the obtuse marginal (OM) branch of the left circumflex coronary (LCX) artery. This balloon has a proximal and a distal radio-opaque marker. Some smaller balloons have only one radio-opaque marker in the middle. The check angio is taken to make sure that the balloon is positioned exactly across the lesion before inflation.