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To calculate the prevalence of asymptomatic localized paranasal sinus aspergillosis (or fungus ball) in the general population and to compare asymptomatic and symptomatic fungus balls (FB) in order to determine their specificities.Retrospective study including 59 patients operated for FB between 2006 and 2011 in a single unit. Patients were divided into two groups: asymptomatic patients (group 1,...