CSF rhinorrhoea

May 10, 2009 at 3:10 am | Posted in medicine | Leave a comment
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Fluid leaking from the nose or external auditory canal must first be positively identified as CSF. Drops of fluid from a CSF leak placed on absorbent filter paper may result in the double-ring sign, which is a central circle of blood and an outer clear ring of CSF. Results of glucose, chloride, and total protein tests of the fluid are not specific or conclusive for CSF.

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