The purpose of this study is to investigate if the space occupying effect of Seprapack will lead to a reduction in post operative adhesions and more healing of the sinus cavity when compared to the use of no packing material.

Inclusion Criteria:

• at least 18 years of age
• requiring bilateral endoscopic ethmoidectomy (anterior or posterior)
• intact middle turbinates
• willing to return for all follow-up visits
• signed written informed consent

Exclusion Criteria:

• patients with craniofacial abnormalities (e.g. cleft palate)
• patients without intact middle turbinates
• patients on long-term oral steroids or other chemotherapeutic agents that might delay healing. Short-term pulse steroid therapy and topical steroids are acceptable
• patients with inflammatory conditions, other than chronic sinusitis or nasal polyposis, including but not limited to sarcoidosis, rhinitis, ozena, Wegner's granulomatosis, nasal malignancy, recreational drug abuse
• patients with cystic fibrosis
• women that are pregnant or women of childbearing age potential who are not practicing an acceptable method of birth control
• patients with bleeding disorders or who are receiving anticoagulants
• patients that may require a Lothrop procedure