Subdural effusion

Definition:

A collection of fluid beneath the outer membrane covering of the brain (called the dura) that can occur following meningitis.

Causes, incidence, and risk factors:

A subdural effusion is a complication of meningitis and may occur in up to a third of meningitis cases. The prevalence of subdural effusion is higher in meningitis caused by Hemophilus influenza and in infants. Some signs may be similar to those seen in meningitis but follow the disease rather than accompany it. In infants, signs include bulging fontanelle, separated sutures, and increasing head circumference (OFC). The effusion may cause fever to persist past the expected time after treatment. Increased pressure can cause vomiting and seizures.