Hydrocephalus may occur as the result of a range of infectious or inflammatory processes. The effects of chronic inflammation - organization of the inflammatory exudate with scarring or gliosis - can produce obstruction to CSF flow, both within the ventricular system and in the basal cisterns and cortical subarachnoid spaces. Bacterial, parasitic and granulomatous infections are much more likely to lead to hydrocephalus than viral infections. Ventricular enlargement rather than hydrocephalus may occur due to an ex-vacuo phenomenon. This is a result of the severe white matter damage or encephalomalacia that is commonly seen in the
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