Case Report| Volume 16, ISSUE 12, P1690-1692, December 2009

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Idiopathic intracranial hypertension; immediate resolution of venous sinus “obstruction” after reducing cerebrospinal fluid pressure to<10cmH2O


      It has been postulated that cerebral venous outflow “obstruction” is a precipitating factor for many cases of idiopathic intracranial hypertension (IIH). We describe a 17-year-old woman with IIH, and “venous obstruction” repeatedly demonstrated on magnetic resonance venography (MRV) that within minutes resolved partially when the cerebrospinal fluid (CSF) pressure was reduced to 11 cmH2O and completely when the pressure was reduced to 8 cmH2O. These findings further support the view that raised pressure is the cause of the “obstruction”, rather than the obstruction being the primary cause of the IIH. It also raises questions about how low the CSF pressure should be reduced at therapeutic lumbar puncture.


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