Subdural Hematoma

Subdural hematoma's occur between the dural membrane and the underlying arachnoid membrane. There are few attachments between the dura and arachnoid and, when hemorrhage occurs within this area a lesion may spread and occupy a large surface area. Subdural hematomas may be further classified as being acute, subacute or chronic. This classification is based on the time symptoms develop. Acute subdural hematoma produces neurological signs and deterioration in consciousness within hours of injury. Subacute subdural hematoma may not produce signs for days whereas chronic subdural hematoma may not demonstrate signs and be clinically diagnosed until weeks or months after injury