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Paranasal sinuses are filled with air Their function is to-humidify and warm the inspired air,provide resonance to voice,lighten the skull bones, andact as thermal insulatorsâ¦ to protect orbit and cranium from variation in temperature of air in our nose Paranasal sinuses are air containing cavities (hollow spaces) in certain bones of skull.
1 Different types of cells in the paranasal sinus and nasal cavity may become malignant. 2  Being exposed to certain chemicals or dust in the workplace can increase the risk of paranasal sinus and nasal cavity cancer. 3  Signs of paranasal sinus and nasal cavity cancer include sinus problems and nosebleeds. Signs of paranasal sinus and nasal cavity cancer include sinus problems and nosebleeds. 2  Tests that examine the sinuses and nasal cavity are used to detect (find) and diagnose paranasal sinus and nasal cavity cancer. 3  Certain factors affect prognosis (chance of recovery) and treatment options.