Section I Anatomy of the Frontal Sinus and Frontal Recess 1. Developmental Bases of the Anatomy of the Frontal Sinuses 2. Radiological Anatomy 3. Applied Surgical Anatomy Section II Endoscopic Surgical Approaches to Frontal Sinus Disease 4. Draf Frontal Sinusotomy I and IIa 5. Draf Frontal Sinusotomy IIb 6. Extended Draf IIb and Other Modificatoins of the Lothrop Procedure 7. The Frontal Sinus Rescue Procedure 8. Draf III (Endoscopic Modified Lothrop)—Inside-Out and Outside-In Approaches 9. Transseptal Approach 10. Endoscopic Endonasal Orbital Transposition for Lateral Frontal Sinus Lesions 11. The Role of Frontal Sinus in Anterior Skull Base Surgery and the Transcribriform Approach 12. Extended Endonasal Anterior Skull Base Approaches 13. Revision Endoscopic Frontal Sinus Surgery 14. Complications of Frontal Sinus Surgery 15. Delivery of Topical Therapy to the Frontal Sinus 16. Postoperative Management: Dressings and Toilet 17. Office-Based Frontal Sinus Procedures Section III Open Surgical Approaches to Frontal Sinus Disease 18. Mini- and Maxi-Trephines 19. Osteoplastic Flap Approach with and without Obliteration 20. Riedel's Procedure and Cranialization of the Frontal Sinus Section IV Management of Specific Frontal Sinus Conditions 21. Frontal Sinus Barosinusitis 22. Frontal Sinus in Patients with Cystic Fibrosis 23. Pneumosinus Dilatans 24. Frontal Sinusitis in Chronic Rhinosinusitis without Nasal Polyposis 25. Frontal sinus in CRSwNP, AFRS, and ASA Triad 26. Frontal Sinus Mucoceles 27. Frontoethmoidal Osteomas 28. Frontal Inverted Papilloma 29. The Frontal Sinus: Fibro-Osseous Lesions 30. Malignant Disease Involving the Frontal Sinus 31. Acute Frontal Osteomyelitis: Intracranial and Orbital Complications 32. Fungal Frontal Sinusitis: Allergic and Nonallergic 33. Frontal Sinus Trauma and Its Management 34. Cerebrospinal Fluid Leak in the Frontal Sinus: Endoscopic Management Section V Controversial Topics in Current Practice 35. The Use of Flaps in Frontal Sinus Surgery 36. Osteitis and the Frontal Sinus 37. Extreme Lateral Lesions: What Is the Limit of Endoscopic Surgery? 38. Use of Image Guidance Technology: Mandatory or Not 39. Balloon Technology in the Frontal Sinus: Useful or Gimmick 40. Minimum versus Maximal Surgical Sinusotomy 41. Patient-Reported Outcome Measures and Outcomes in Frontal Sinus Surgery: Do They Make a Difference? 42. Symptoms of Frontal Sinus Disease: Where is the Evidence? 43. Anatomy and Classification of Frontoethmoidal Cells 44. To Drill or Not to Drill 45. Indications for Operating the Frontal Sinus: Primary Surgery or Always Second Line? 46. Economic and Quality-of-Life Evaluation of Surgery and Medical Treatmemt for Chronic Rhinosinusitis 47. Training Models and Techniques in Frontal Sinus Surgery 48. Augmented Reality in Frontal Sinus Surgery 49. Robotic Surgery: Beyond Da Vinci 50. Pathophysiology of the Failed Frontal Sinus and Its Implications for Medical Management