Hematoma is an unusual collection of blood outside the blood vessels due to internal hemorrhage. Subdural or extradural hematoma is caused by head injuries, and it is a life–threatening condition. These hematomas can be removed through suction, for which the physician has to perform an incision of the scalp, craniotomy, or craniectomy. A supratentorial hematoma is the accumulation of blood in the region above the tentorium cerebella (or the cerebellar tentorium –– the extended dura mater that surrounds and separates the cerebellum from the other parts of brain in the posterior cerebral hemisphere).
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