5 mm, or GCS drop by two or more points from the time of injury to hospitalization. Nonoperatively managed hematomas may stabilize and eventually reabsorb, or evolve into chronic SDHsPrompt neurosurgery or radiologically guided interventions with medications and other treatments to help prevent recurrence of the bleeding and complications. Many aneurysms are treated by a less invasive procedure called "coiling", which is carried out by instrumentation through large blood vessels.MORTALITY15 and20%30% overall, 60 to 80% in acute SDHUp to half of all cases of S AH are fatal and 10-15% of casualties die before reaching a hospitalPOORPROGNOSIS* Advanced age* Intradural lesions* Temporal location* Increased hematoma volume* Rapid clinical progression* Pupillary abnormalities* Increased intracranial pressure* Lower Glasgow coma scale (GCS)* No lucid interval* Acute subdural hematomas* Glasgow coma scale 80* Acute duration* hypodensity of SDH on CT scan">