Imaging of meningitis and ventriculitis.

Central nervous system infections account for 1% of primary hospital admissions and 2% of nosocomial infections and when encountered require prompt diagnosis and initiation of specific treatment. Imaging findings are mostly nonspecific with respect to the causative pathogen. This article describes the anatomy of cranial meninges and extra-axial spaces of the brain. Characteristic findings and recent advances in neuroimaging of meningitis and its complications and ventriculitis are summarized, and certain noninfectious causes of meningitis and meningitis mimics are described.