International Frontal Sinus Anatomy Classification

International Frontal Sinus Anatomy Classification (IFAC) result from an expert consensus, developed to improve the ability of the surgeon to understand the possible variations of the frontal recess and frontal sinus anatomy.

Classification

• anterior cells: push the drainage pathway of the frontal sinus medial, posterior or posteromedially
  • agger nasi cell
  • supra agger cell
  • supra agger frontal cell
• posterior cells: push the drainage pathway anteriorly
  • supra bulla cell
  • supra bulla frontal cell
  • supraorbital ethmoid cell
• medial cells: push the drainage pathway laterally
  • frontal septal cell