A 58-year-old male presented with pain and swelling in his left leg for years. Imaging showed a giant pseudoaneurysm of the left femoral artery measuring 9.46x9.52x5.29 cm, diagnosed 25 years after a war injury and surgery to his left femur. The pseudoaneurysm was likely caused by the initial injury or contact with fixation hardware. The pseudoaneurysm was successfully treated with open surgery using resection and a vascular graft. The patient recovered well after surgery. Giant pseudoaneurysms after trauma can present delayed and may require open surgery rather than endovascular approaches.