 At its most basic level, sinusitis is defined as an inflammation of the lining membrane of the paranasal sinuses. Sinusitis affects all age groups, including 17 of people above the age of 65 years. On the basis of national population surveys and insurance-reimbursement claims, sinusitis is one of the most common health problems in the U.S. Thus, each year, billions of dollars are spent on direct medical costs for the treatment of this enigmatic illness. 