According to the most recent consensus meeting in Brussels,17 chronic rhinosinusitis in children is defined as a sinus infection with low-grade symptoms and signs that persists for longer than 12 weeks. This definition allows for a diagnosis without the previously mandatory computed tomography (CT) scan, based on the consensus panel's belief that imaging all children with suspected chronic rhinosinusitis is not feasible.17 Patients with acute exacerbations of chronic rhinosinusitis may have multiple acute episodes in addition to persistent low-grade symptoms and signs that do not resolve completely between acute episodes.

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