- The brain is covered by a membrane (layer of tissue) called the dura. If the veins located below the dura (subdural area) leak blood, then pressure in this area may build up and injure the brain. Head injuries may injure these veins, causing them to be torn and leak. This blood collects into a mass called a hematoma. Hence the name, Subdural Hematoma. For an acute hematoma, symptoms generally occur in the first 24 hours, while for a subacute Hematoma, they occur in the first 2-10 days after a head injury.
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