The ‘paranasal sinuses’ are the air cavities within the skull that open into the nose. Some children with cystic fibrosis may develop nasal polyps. For example, while lying supine, the polyp may swing posteriorly, opening up the nasal cavity. It’s thought that the electromagnetic wave created by the to-and from passage of air molecules tones up the pituitary-hypothalamic area of the brain above the back of the nasal passage. Presumably steroid sprays may be needed on a long-term basis to prevent the polyps from enlarging after they shrink. Most of this material is deposited around the front portion of the middle turbinate. Overall, nasal polyps are relatively rare, occurring in only about 4% of the population.