Papilloedema present. Normal neurologic examination except for cranial nerve abnormalities (typically VI nerve/s). Normal neuroimaging: no evidence of hydrocephalus, mass or structural lesion, and no abnormal meningeal enhancement on magnetic resonance imaging. Typical radiological features of stigmata of raised intracranial pressure are shown in Fig 4. Normal cerebrospinal fluid composition. Raised lumbar puncture opening pressure (≥250 mmCSF in adults and ≥280 mmCSF in children (250 mmCSF if the child is not sedated and not obese)) in a properly performed lumbar puncture.
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