Sinusitis
Sinusitis refers to inflammation of the sinus cavities, which are moist, hollow spaces in the bones of the skull. There are four pairs of sinuses:Frontal sinusesMaxillary sinusesEthmoid sinusesSphenoid sinuses (not shown in illustration)If the opening from a sinus cavity becomes plugged, the flow of mucus is blocked and pressure builds up, causing pain and inflammation.
Review Date: 04/13/2006
Reviewed By: A.D.A.M. Medical Illustration Team
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