Traumatic aneurysm is produced by tangential laceration of the wall of artery resulting in extravasation of blood in the surrounding tissue. Haematome liquifies and fibrous tissue forms the wall of this aneurysm differentiating it from true aneurysm which has normal arterial wall. It is presented as localised mass which enlarge to cause pain and paralysis. Pulsation is not a frequent finding as most of the cavity is felled with thrombus. Operation is indicated as soon as diagnosis is established specially when there are signs of crucial nerve compression or danger of rupture.