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Considering the effects of the micronized douches independently from the type of solution used (either hyaluronic acid or isotonic saline solution), although no difference emerged between study and control group for any of the objective parameters, there was an improvement of Sino-Nasal Outcome Test-22 scores (p = .0005), visual analogue scale for nasal obstruction (p = .0006) and for hyposmia/hypogeusia (p = .04). Conclusions The treatment with micronized nasal douches can improve the sino-nasal symptoms of CRSsNP, in particular nasal