Rhinosinusitis.

Rhinosinusitis is a significant contributor to patient morbidity, impacting quality of life and health care costs. This article provides an evidence-based review of rhinosinusitis, including classification, pathophysiology, diagnostic criteria, and management strategies. Special emphasis is placed on differentiating rhinosinusitis from other conditions, differences between acute and chronic sinusitis, the role of imaging, and indications for referral for potential surgical intervention.