Note the marked dilation of the cerebral ventricles. This is hydrocephalus. Hydrocephalus can be due to lack of absorption of CSF or due to an obstruction to flow of CSF. Hydrocephalus can be a long-term complication of infection. A basilar meningitis, for example, may lead to scarring that obstructs CSF outflow via the foramina of Luschka or Magendie. Inflammation with scarring of arachnoid granulations at the vertex may diminish CSF absorbtion.

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