Figure 15: Case report 13. 1. 14-year-old patient with CF. Coronal STIR sequence. Extensive hyperintense signal in the paranasal sinuses and the nasal cavity because of mucosal proliferation. Inferior nasal turbinate still delineable on both sides (white arrows). The walls of the maxillary sinuses are medially displaced, the middle turbinate can no longer be identified (black arrows). 2. 14-year-old female patient with CF. (A) Polyposis of the right middle nasal passage as shown by MRI. Polyps and small mucoceles are resected by means of a shaver with oscillating knives (#). (B) Free view into the middle nasal passage lateral to the middle turbinate (*) in direction of the posterior ethmoid cells after resection of the polyposis.