[Spontaneous intracranial hypotension: an unrecognized diagnosis]

We report an observation of spontaneous intracranial hypotension occurring in a 32-year-old man. The diagnosis of intracranial hypotension is easy in a suggestive context: after a lumbar puncture or a diversion of CSF. Clinical and CSF cytological features can mimic chronic meningitis leading to false diagnosis and erroneous therapeutic. Magnetic resonance imaging allows diagnosis. This uncommon and benign pathology must be better known.