Definition of Subdural effusion
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 . Subdural effusion is more common in infants and in persons who have meningitis caused by Haemophilus influenzae.
Signs and tests
There is often a recent history of bacterial meningitis. Tests include:
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.
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.
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. – 9/13/2010