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  1. Achim Frese,
  2. Stefan Evers
  1. Department of Neurology, University of Münster, Albert-Schweitzer Strasse 33, 48129 Münster, Germany; fresea@uni-muenster.de

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    Dr Larner highlights an important diagnostic problem. The sensitivity of brain CT to subarachnoid haemorrhage (SAH) is high (95%) within the first 48 hours after onset but drops to ≤30% after two weeks. CSF analysis can show xanthocromia for …

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