What's a subdural hematoma?

Blood clot: A subdural hematoma is a blood clot that has formed on top of the brain and underneath the covering of the brain. It is usually due to a traumatic event or if the patient's blood is being thinned. It can be nonsurgical or surgical depending on how large it is and what the patient's neurological status is.

SDH: A subdural hematoma typically occurs from bridging cortical veins being torn causing blood to accumulate on the surface of the brain under the dural covering of the brain. Trauma is the most common cause. In the elderly, even relatively minor head trauma can cause a sdh. Surgery is often used to evacuate the hematoma.

Blood inside skull: Subdural hematomas are collections, usually venous blood, from a torn vein between the brain and the fibrous membrane surrounding the brain called the Dura Mater.