sinusitis is a topic covered in the Taber's Medical Dictionary.

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[L. sinus, curve, hollow, + Gr. itis, inflammation]
Inflammation of a sinus, esp. a paranasal sinus. It may be caused by various agents, including viruses, bacteria, or allergy. Predisposing factors include inadequate drainage, which may result from presence of polyps, enlarged turbinates, or a deviated septum; chronic rhinitis; general debility; or dental abscess in maxillary bone.

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