Brain haemorrhage. Coloured axial computed tomography (CT) scan of a section through a head showing a subdural haematoma (red, left). This occurs when an injury causes bleeding between the membranes that surround the brain. The blood rapidly clots to form a solid mass. Subdural haematoma is a dangerous condition as it puts pressure on the brain. It is usually caused by an impact. It is more common in the elderly, as the blood vessels involved become more fragile with age. People with blood clotting problems, such as haemophiliacs, are also at risk. Treatment is usually the surgical removal of the clot. CT scans use X-rays to image sections of the body.
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