The Bolger classification of maxillary sinus hypoplasia proposed by Bolger et al. in 1990 1 takes into account associated anomalies of the uncinate process, which are of utmost importance for planning functional endoscopic sinus surgery (FESS).
Maxillary sinus hypoplasia in itself is asymptomatic and usually encountered as an incidental finding at imaging.
- mild hypoplasia
- normally developed uncinate process
- well developed infundibulum
- significant hypoplasia
- hypoplastic/absent uncinate process
- poorly defined or absent infundibulum
- profound hypoplasia
- absent uncinate process