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Behçet disease is a multisystem vasculitis characterized by mucosal aphthosis, primarily in the oral and genital mucosa. Only a few cases of involvement of the nasal mucosa have been reported in the literature, and its true prevalence is not known. We conducted a cross-sectional study of 400 consecutively presenting patients with confirmed Behçet disease (according to classification-tree criteria) to determine the incidence of nasal mucosal involvement, to identify its particular characteristics, and to determine if there are any statistically significant differences in clinical and paraclinical parameters between Behçet disease patients with nasal involvement and those without. To the best of our knowledge, this is the first systematic evaluation of nasal involvement …