A 28-year-old woman undergoes femoral artery catheterization for coronary angiography. Six hours post-procedure, she develops a pulsatile mass in the groin with pain and mild swelling. Doppler ultrasound confirms a 2.5 cm pseudoaneurysm of the femoral artery with a 4 mm neck. She is hemodynamically stable with intact distal pulses. What is the most appropriate next step in management?