Case Description

An 85-year-old man with stable angina underwent an elective percutaneous coronary intervention through the right radial artery under dual antiplatelet therapy. One hour after the procedure, he reported increasing pain in his right axilla. A noncontrast computed tomography scan revealed a massive axillary hematoma, suggestive of catheter-related arterial bleeding (Fig. 1). Urgent angiography via percutaneous right brachial artery access revealed the perforation of an axillary coronary artery branch (Fig. 2A). The extravasation was not observed in selective angiography of thoracoacromial artery branches (Fig. 2B). The small side branch distal to the thoracoacromial