A subdural effusion is a rare complication of bacterial meningitis. Subdural effusion is more common in meningitis caused by Hemophilus influenzae and in infants. Some signs of effusion are similar to those of meningitis, but these follow the disease rather than accompany it. In infants, signs include fever, lethargy, bulging fontanelles, separated sutures, and increasing head circumference. The effusion may cause fever to persist past the expected time after antibiotic treatment. Increased pressure on the brain due to the effusion can cause lethargy, vomiting, and seizures.
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