A subdural hematoma develops when tiny veins that run between the dura and the surface of the brain tear and leak blood. A collection of blood then forms over the surface of the brain. In a chronic subdural collection, the blood which leaks from the veins does so slowly over time. This can happen as a result of a head injury or, less frequently, it can occur spontaneously if the patient is elderly.
Risks include head injury, old age, chronic use of aspirin or blood thinning (anti-coagulant) medication, and chronic heavy alcohol use.
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