Van Gerven L, et al. - The purpose of this trial was to investigate the efficacy of leukotriene antagonists in chronic rhinosinusitis (CRS). Additionally, it also incorporated the assessment of montelukast as an add-on treatment to intranasal corticosteroids (INCS) in a postoperative setting. The yielded data did not recommend the addition of montelukast to INCS for the treatment of postoperative CRS with nasal polyp (CRSwNP) patients.