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paranasal sinus and nasal cavity cancer (PAYR-uh-NAY-zul SY-nus ... NAY-zul KA-vuh-tee KAN-ser)
Cancer that forms in tissues of the paranasal sinuses (small hollow spaces in the bones around the nose) or nasal cavity (the inside of the nose). The most common type of paranasal sinus and nasal cavity cancer is squamous cell carcinoma (cancer that begins in flat cells lining these tissues and cavities).