Rhinosinusitis.

Although sinusitis is common, controversy exists regarding terminology, diagnostic criteria, indications for imaging, and treatment guidelines. Patients who are diagnosed with bacterial sinusitis should be started on amoxicillin-clavulanate unless an allergy to penicillin is reported, in which case doxycycline or a respiratory fluoroquinolone is indicated for non-pregnant patients. Patients who fail to respond to antibiotic therapy should be suspected of having chronic sinusitis, which may requirea dditional therapy, including endoscopic surgery.