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Subdural effusion

A subdural effusion is a collection of fluid trapped between the surface of the brain and the outer lining of the brain (the dura matter). 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

The doctor or nurse will examine you. 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.

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

References

Koshy A, Roos K. Infections of the nervous system: bacterial and fungal. In: Daroff RB, Fenichel GM, Jankovic J, Mazziotta JC, eds. Bradley’s Neurology in Clinical Practice. 6th ed. Philadelphia, Pa: Saunders Elsevier; 2012:chap 53C.

Swartz MN, Nath A. Meningitis: bacterial, viral, and other. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 420.

Updated: 8/29/2012

David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Luc Jasmin, MD, PhD, Department of Neurosurgery at Cedars-Sinai Medical Center, Los Angeles, and Department of Anatomy at UCSF, San Francisco, CA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.


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