Which type of surgery does a subdural hematoma require?

Cranial burr holes: Cranial burr hole evacuation of the hematoma. For large for acute hematomas, craniotomy may become necessary.

Drainage: If a subdural is causing increased intracranial pressure and threatening herniation of brain structures, the surgical procedure is to drill a burr hole through the skull and drain the subdural blood.

Craniotomy: If surgery is required, a craniotomy is typically performed to evacuate the blood clot.