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This document discusses sinusitis, or inflammation of the paranasal sinuses. It defines sinusitis as inflammation of one or more of the four pairs of air-filled cavities surrounding the nasal passages. The sinuses are lined with respiratory epithelium that produces mucus. Sinusitis can be caused by bacterial or viral infections, allergies, tumors, or other non-infectious factors. It can be either acute (<4 weeks) or chronic (lasting over 12 weeks). Microscopically, sinusitis is characterized by inflammatory

Author

primaswari

Language

EN