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Cancer

sphenoid sinus

A type of paranasal sinus (a hollow space in the bones around the nose). There are two large sphenoid sinuses in the sphenoid bone, which is behind the nose between the eyes. The sphenoid sinuses are lined with cells that make mucus to keep the nose from drying out.

( SFEE-noyd SY-nus )
Source: NCI Dictionary of Cancer Terms

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sphenoid bone
sphincter
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