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Sinusitis is a term that physicians and patients often use, though they have grave difficulty in defining it precisely. Nevertheless, we know it is a common disorder with manifestations that vary from acute illness after a viral upper respiratory tract infection to an unremitting chronic ailment associated with a genetic abnormality in the epithelium of patients with cystic fibrosis. It can even present as a life-threatening intracranial infection. Sinusitis is the most common chronic health problem described by Americans; it affects all age groups, including 17 percent of people over the age of 65 years. Patients make millions of office
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