A 58-year-old man from Delhi presents to the emergency department with acute right groin pain and swelling following a fall while climbing stairs. On examination, there is a tender, pulsatile mass in the right groin below the inguinal ligament. The mass is expansile on palpation, and a continuous 'machinery' murmur is heard on auscultation. Femoral pulses are bounding distally. What is the most likely vascular complication at this anatomical site?