Reference Index - Disease & Conditions

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Subdural effusion

Definition:

A subdural effusion is a collection of fluid beneath the outer lining of the brain. If this fluid becomes infected, the condition is called a subdural empyema.



Causes, incidence, and risk factors:

A subdural effusion is a rare complication of bacterial meningitis . Subdural effusion is more common in infants and in persons who have meningitis caused by Haemophilus influenzae .



Symptoms:

Signs and tests:

There is often a recent history of bacterial meningitis. Tests include:



Treatment:

Surgery to drain the effusion is often necessary. Rarely, a permanent drainage device (shunt) is needed to drain fluid. Antibiotics may need to be given through a vein.



Support Groups:



Expectations (prognosis):

Full recovery from a subdural effusion is expected. If neurological problems continue, they are generally due to the meningitis, not the effusion. Long-term use of antibiotics is usually not necessary.



Complications:

Complications from surgery include:

  • Bleeding
  • Brain damage
  • Infection


Calling your health care provider:

Call your health care provider if:

  • Your child has recently been treated for meningitis and symptoms continue
  • New symptoms develop


Prevention:



References:

Swartz MN. Meningitis: bacterial, viral, and other. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 437.




Review Date: 9/13/2010
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Daniel B. Hoch, PhD, MD, Assistant Professor of Neurology, Harvard Medical School, Department of Neurology, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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