I don't know if this fits in this topic,but years ago I knew a woman and we were talking and I mentioned I had taken my 5 month old baby to the Doctors and he said that she had a problem with a sinus infection. She said "Wow what a stupid Doctor, doesn't he know babies aren't born with sinus's." That was many years ago and I still laugh when I remember what she said.
Yes, I've often heard 'sinus' referred to as a condition rather than a body part.
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