Rhinosinusitis is an inflammation of the paranasal sinuses and the nasal cavity lasting no longer than 4 weeks. It can range from acute viral rhinitis (the common cold) to acute bacterial rhinosinusitis. Fewer than 5 in 1,000 colds are followed by bacterial rhinosinusitis.
Chronic rhinosinusitis (CRS) is an inflammatory condition affecting the nasal cavity and sinuses, which can be categorized into eosinophilic and non-eosinophilic subtypes.
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