Inclusion Criteria:

• Patient ≥ 18 year-old
• Patient with nasal sinus polyposis resistant to medical treatment and requiring surgical treatment with ethmoidectomy type is considered for the first time
• Having signed the consent form
• Having an health insurance

Exclusion Criteria:

• Current or past biotherapy treatment
• Taking general corticosteroid therapy within 4 weeks of surgery
• Protected person
• Pregnant women or lactating women