Ligation of the carotid artery remains an accepted treatment for unclippable giant carotid artery aneurysms. Postoperative evaluation is commonly made subsequently by CT scan and angiography, the latter involving an invasive procedure. This paper describes the magnetic resonance (MR) appearance of a traumatic giant terminal carotid artery aneurysm treated by common carotid ligation. MR appears to be the imaging technique of choice for follow-up of giant aneurysms of the terminal carotid artery treated by carotid ligation, the accuracy of delineation of the aneurysm and its content surpassing that of the CT scan.