Traumatic arteriovenous (AV) fistulas are the vascular lesions which usually develop due to penetrating or blunt injuries or rarely due to an iatrogenic cause. Gunshot wounds, penetrating injuries, or bone fractures which are located in an adjacent artery and vein constitute the major etiology of the traumatic AV fistulas. Arteriovenous fistulas may not be diagnosed for years and may require surgical intervention long after the injury. When a traumatic AV fistula is not treated immediately and appropriately, it may cause subacute and chronic complications. Traumatic AV fistulas may progress to rarely encountered aneurysmatic dilatations in chronic periods. In this article, we report a 33-year-old male case with a neglected traumatic AV fistula which progressed to a facial AV aneurysm and received endovascular treatment successfully using transcatheter embolization technique.