This book Anatomical Principles of Endoscopic Sinus Surgery is evidence-based 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. In this book 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. CT scan variations should be studied to understand embryology of the nose and para-nasal sinuses. It is extensively illustrated using cadaveric dissection specimens with explanatory line diagrams alongside. There are also endoscopic pictures, CT scans and schematic diagrams. This book will be of immense value to all aspiring and established sinus surgeons.