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(Extra-axial Haematoma; Subdural Haemorrhage; SDH)
Pronounced: sub-dur-al hee-ma-toe-ma
by Deanna M. Neff, MPH
A hematoma is a collection of blood. A subdural hematoma develops in the space between the covering of brain (the dura) and the inside of the skull. This pool of blood can put pressure on the brain and cause a range of symptoms.
A subdural hematoma is most often caused by a head injury. The injury may be caused by traumas such as falls, car accidents, or physical abuse. It can also occur spontaneously.
Risk Factors TOP
Factors that increase your chance of a subdural hematoma include:
The blood may pool quickly or take some time to build up. This will affect how fast symptoms develop. The subdural hematoma may be:
After a head injury, a subdural hematoma may cause the following symptoms:
Seek medical care right away if you have any of these symptoms after a head injury.
Your doctor will ask about your symptoms and medical history. A physical exam will be done. You may also be referred to a specialist for additional testing.
Imaging tests evaluate the brain and surrounding structures. This can be done with:
Your brain function may be assessed. This can be done with:
Your bodily fluids may be tested. This can be done with blood tests.
Talk with your doctor about the best treatment plan for you. Treatment will depend on the size and severity of the hematoma. It will also be based on your specific symptoms.
Treatment options include the following:
Monitor and Observe
A minor injury with little or no symptoms may not need treatment. Your doctor may simply ask that you watch for any new symptoms. It can take days and weeks for some symptoms to develop.
Medication may be given to relieve symptoms. Some medications may include:
To help reduce your chance of a head injury:
American Academy of Otolaryngology—Head and Neck Surgery
Brain Injury Association of America
Brain Injury Canada
Ontario Brain Injury Association
Servadei F, Compagnone C, Sahuguillo J. The role of surgery in traumatic brain injury. Curr Opin Crit Care. 2007;13(2):163-168.
Subdural hematoma. EBSCO Dynamed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T114154/Subdural-hematoma. Updated March 1, 2016. Accessed September 29, 2016.
Subdural haematoma. Patient UK website. Available at:
...(Click grey area to select URL)
Updated September 28, 2011. Accessed June 2, 2014.
Last reviewed May 2016 by Rimas Lukas, MD
Last Updated: 6/2/2014
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