Probably mucous: The paranasal sinuses are usually air-filled but it is not uncommon to see small amounts of fluid and/or mucous, which can occasionally have a frothy appearance on a ct scan. "bubbly residue" is admittedly not standard medical terminology.
Answered 5/15/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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