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. The effusion may cause fever to persist past the expected time after treatment.
Increased pressure can cause vomiting and seizures .