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When was his SINUS surgery ??
How long has he had the nasal discharge and cough?
It sounds this far to me to be more likely to be a respiratory infection rather than a CSF leak....
A runny nose / salty taste persisting following surgery could be a fit ...
I have impression his surgery was some time ago??
Let me know what details may be helpful
I will be happy to get back with you
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Anthony Bray MD