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Normal pressure hydrocephalus: false positives
  1. Martin J Larner1,
  2. Andrew J Larner2
  1. 1Bristol Royal Infirmary, Bristol, UK
  2. 2Walton Centre for Neurology and Neurosurgery, Liverpool, UK
  1. Correspondence to:
 Dr A J Larner, Cognitive Function Clinic, The Walton Centre for Neurology and Neurosurgery, Lower Lane, Fazakerley, Liverpool L9 7LJ, UK;

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In their informative article on idiopathic normal pressure hydrocephalus (NPH), Malm and Eklund (

) discuss cerebrospinal fluid (CSF) tap tests in the evaluation of suspected cases, and point out that false negatives may occur (that is, patient improves after surgery …

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