A hematoma, or clot, is an unusual collection of blood outside the blood vessels due to an internal hemorrhage. In this procedure, the provider drills burr holes in and may open the skull to access the brain below the tentorium to drain and relieve pressure from a hematoma on or under the dura. A hematoma can occur as a result of trauma, a medical procedure, or when a spontaneous bleeding into the brain tissue occurs from a stroke.
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