This book contains a complete overview of all surgical techniques, describes all current indications of the techniques, and considers all relevant clinical aspects. The practitioner has a quick and complete overview of the current state of the art in the field.Main Topics:Endonasal sinus surgery - basic principles and approaches; Technique of endoscopic endonasal surgery; Results of endonasal sinus surgery for chronic sinusitis; Results in defined patient groups; Extended spectrum of endoscopic endonasal surgery; Complications, side-effects and sequelae; Postoperative care following endoscopic surgery; Technical innovations; Summary and prospects