Part I: Definitions and Basics -- Definition and Clinical Signs and Symptoms -- Burden and Health Impact of Pediatric Rhinosinusitis -- Pathogenesis of Pediatric Sinusitis -- Imaging in Children -- Microbiology of Pediatric Sinusitis -- Part II: Sinusitis and other Pediatric Issues -- The Role of Adenoids in Pediatric Sinusitis -- Allergy and Sinusitis -- Sinusitis and Asthma -- Chronic Rhinosinusitis in Children with Cystic Fibrosis -- Sinusitis and Immune Deficiency in Children -- Pediatric Rhinosinusitis and Gastroesophageal Reflux -- Sinusitis and Adenoiditis -- Part III: Medical Treatment of Sinusitis -- Antibiotics: Intranasal and Systemic Treatment of Sinusitis in Children -- Saline Irrigation in Pediatric Rhinosinusitis -- Medical Treatment of Pediatric Rhinosinusitis: Focus on Intranasal and Systemic Corticosteroids -- Part IV: Adenoidectomy and Sinus Lavage -- Balloon Sinuplasty in Children -- Endoscopic Sinus Surgery for Pediatric Patients -- Septoplasty and Turbinate Reduction in Children -- Post-operative Management of Pediatric Sinusitis -- Failure of Surgical Treatment in Children with Chronic Rhinosinusitis -- Part V: Complications -- Complications of Sinusitis.