Meningitis - septation of subarachnoid spaces
Mental status change with fever.
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Diffuse and extensive thickening with enhancement of the leptomeningeal structures at both, infra- and supra-tentorial levels with associated enlargement with internal septation of the subarachnoid spaces mainly at the frontal regions. Dilatation of the 3rd and lateral ventricles (obstructive hydrocephalus).
MRI features suggestive of extensive meningitis with internal septation of the subarachnoid spaces. Unfortunately, the patient died a few hours after the MRI examination even before a lumbar puncture is performed to establish its nature.
The internal septation of the subarachnoid spaces is usually seen in the late phase (complication phase) of bacterial meningitis (including tuberculous origin) with hydrocephalus due to an obstruction at the level of the aqueduct of Sylvius or 4th ventricle.