SDH is subdural hematoma is also commonly seen in the elderly and in alcoholics, who have evidence of cerebral atrophy. It is also more common in patients on anticoagulants, especially aspirin and warfarin. Patients on these medications can have a subdural hematoma with a minor injury and it is abnormal localized collection of blood in which the blood is usually clotted or partially clotted..
The treatment of a hematoma depends on its location and size. Treatment can involve draining the accumulated blood. A hematoma in or near the brain is particularly dangerous
"Other small subdural hematomas can be managed by inserting a temporary small catheter through a hole drilled through the skull and sucking out the hematoma; this procedure can be done at the bedside. Large or symptomatic hematomas require a craniotomy, the surgical opening of the skull. A surgeon then opens the dura, removes the blood clot with suction or irrigation, and identifies and controls sites of bleeding. Postoperative complications include increased intracranial pressure, brain edema, new or recurrent bleeding, infection, and seizure. The injured vessels must be repaired".