When UP is attached to the cell, it is classified as type 2 according to Stamberg classification. Coronal CT image showed the relationship between EB and UP.

 
 
  Part of: Doğan E, Kilinç MR (2022) Evaluation of paranasal anatomical variations with multidetector CT in Turkish population. Folia Medica 64(3): 513-520. https://doi.org/10.3897/folmed.64.e62633