Head injury (subdural haematoma). Coloured computed tomography (CT) scan of a subdural haematoma (orange, left) placing pressure on the brain of a patient who has been involved in a road traffic accident. This is an axial (horizontal) section through the brain and skull, with the front of the brain at top. A subdural haematoma is the bleeding and clotting of blood in the subdural area under the brain's dura mater membrane. The blood places pressure on the brain, and a right temporal haemorrhage (bleeding in the brain) is affecting the brain's ventricles (dark areas at centre). Surgery can be used to relieve the pressure on the brain. CT scanning uses X-rays to look at structures inside the body.
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