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Front view illustration and sidebyside CT scans of normal and chronic sinusistis Labeled frontal sinus ethmoid sinuses maxillary sinus nasal septum eye socket Sinusitis is inflammation of the paranasal sinuses which may be due to infection allergy or autoimmune issues Most cases are due to a viral infection and resolve over the course of days It is a common condition for example in the United States more than million cases occur annually


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