Femoral and popliteal artery aneurysms constitute the majority of peripheral arterial aneurysms. However, aneurysm of the profunda femoral artery is highly uncommon, being mainly of traumatic and mycotic origin. Diagnosis is usually straightforward with clinical and radiological examination, and such aneurysms are only rarely misdiagnosed as tumors. We herein report a case of preoperatively diagnosed pseudoaneurysm of the profunda femoral artery that was intraoperatively found to be a soft tissue tumor and finally revealed to be a schwannoma, by pathology. Our case's unusual presentation considerably confounded both diagnosis and management, thus providing a salutary clinical lesson.