Brain haemorrhage. Coloured 3D computed tomography (CT) angiogram of the head of a 49-year-old patient, showing the right internal carotid artery and an intra-cerebral aneurysm (arrow), the cause of a meningeal haemorrhage. An aneurysm occurs when an artery wall weakens and swells like a balloon. If it bursts (as here), an aneurysm can cause severe internal haemorrhage. Meningeal haemorrhage is bleeding caused by damage to the middle meningeal artery, one of the two terminal branches of the external carotid artery.