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Treated brain haemorrhage. Coloured computed tomography (CT) scans of sections through the brain of a 64-year-old man with a large haematoma (collection of blood, pink) of the superficial middle cerebral vein (superficial Sylvian vein) of the left hemisphere (right). The top four scans show the brain before treatment, whilst the lower four were taken after trepanation to remove the accumulated blood. Bleeding (haemorrhage) in the brain occurs when a blood vessel ruptures. It may occur spontaneously or be caused by a head injury, high blood pressure or vascular disease. Trepanation involves making a small hole in the skull, through which the blood can be drained, thus relieving the pressure on the brain.
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