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The brain is surrounded by a strong protective membrane called the meninges. The meninges themselves are composed of 3 distinct layers, the dura, arachnoid and pia from superficial to deep. Potential spaces occur between these layers and if sufficient force is applied, collections of blood can accumulate within these spaces.
An extradural haematoma is a collection of blood between the skull and outer layer of dura.
It is most common in younger patients as a result of high impact head trauma. There is usually an overlying skull fracture and damage to a superficial artery leading to the collection of blood.
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