Bolger Classification of Maxillary Sinus Hypoplasia

• Bolger et al (1990)¹ classified maxillary sinus hypoplasia into one of 3 types:
  • Type 1:
    • Mild maxillary sinus hypoplasia with a normal uncinate process and a patent infundibular tract.
  • Type 2:
    • Mild to significant maxillary sinus hypoplasia with a hypoplastic or aplastic uncinate process.
    • The infundibular passage is ill defined or absent.
    • In these cases, the maxillary sinus is completely opacified by soft tissue density.
  • Type 3:
    • Profound maxillary sinus hypoplasia with an absent uncinate process.
    • In these cases, the sinus is represented only by a shallow cleft in the lateral nasal wall.

Bolger Classification of Maxillary Sinus Hypoplasia