Artery damage, coloured MRA scan sequence. Magnetic resonance angiography MRA scans showing artery damage on one side of a male 23_year_old motorcycle crash patient. Narrowing of the proximal right internal carotid artery continues throughout its length and is the result of damage to the wall of the vessel. The muscular layers within the arterial wall get damaged and arterial blood is forced between the muscular lining, which causes the narrowing. For the undamaged side see clip number K003 4499. For both sides see clip number K003 4502. For original see clip number K003 4408.