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  Index:   Untitled SA - SG     Untitled SH - SR     Untitled ST - SZ    
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  • Sinus: SFAF
    a hollow cavity. See also paranasal sinus.
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    • Paranasal Sinus: SFAF
      an air-filled cavity within the skull; there are 4 sets of paranasal sinuses: frontal, maxillary, sphenoidal and ethmoid.
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