This evidence-based book summarizes the latest and best clinical studies supporting the practice recommendations and grade each study to indicate the benefits and risks the therapy and reliability of the study results. Discusses in detail the anatomy of nose and paranasal sinuses as viewed by an endoscopic surgeon. It explains the precautions and procedures to map the skull and emphasizes that 3-dimensional mapping is essential to conduct endoscopic sinus surgery. 1. Embryology, 2. Osteology, 3. The Lateral Nasal Wall, 4. Endoscopic Anatomy, 5. Radiological Anatomy, 6. Anatomical Variations, 7. Surgical Anatomy.