Iatrogenic intracranial hypotension - enlarged subdural spaces
Febrile convulsion, nystagmus, and generalized hypotonia. Had twice lumbar puncture 4 days ago.
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At the posterior cerebral fossa, there is a bilateral pericerebellar fluid collection of CSF signal on all sequences. At the supratentorial level, there is also a bilateral fluid collection of CSF signal on all sequences, displacing the cerebral parenchyma medially with pachymeningeal enhancement. Presence of superficial cortical veins, traversing these collections "cortical vein sign" well-visualized on coronal T2WI at both infra/supratentorial levels, indicating enlarged subarachnoid spaces and not subdural hygroma. Note collapsed ventricular system at the supratentorial level.
A high signal intensity on FLAIR, and T2WI of the frontoparietal white matter mainly on the right with leptomeningeal enhancement indicating most likely a meningoencephalitis.