Inclusion Criteria:  Patients older than 18 years old Chronic rhinosinusitis with Nasal Polyps Olfactory loss Clinical indication for treatment with Dupilumab  Exclusion Criteria:  Patients with olfactory loss from other causes such as:  Sinonasal malignancies Trauma Idiopathic olfactory loss Use of cocaine COVID-19 related olfactory loss Pregnancy