CT images of responsive and non-responsive patients. Pre (A) and post ELX/TEZ/IVA (B) coronal reformatted CT images through the maxillary and ethmoid sinuses of a 12-year-old male patient demonstrate complete opacification before treatment (A), but only minimal mucosal thickening after treatment (B). Pre (C) and post ELX/TEZ/IVA (D) coronal reformatted CT images through the maxillary sinuses of a 20-year-old male patient demonstrate complete opacification of the maxillary sinuses, ethmoid air cells, and nasal cavity prior to treatment (C). After treatment (D), there is improvement in the right anterior ethmoid air cells and nasal cavity, but no aeration of the maxillary sinuses.