Polypectomy is the surgical removal of polyps (abnormal inflammatory tissue growths) that are located in the nasal passages. If polyps recur, it may be necessary to remove polyps from the deeper ethmoid, sphenoid, and maxillary sinus linings to provide longer-lasting relief. The polyps originate near the ethmoid sinuses (located at the top of the nose on both sides of the nasal cavity) and grow into the open areas of the nasal cavity. Large polyps can obstruct the airway and block drainage from the sinuses. Sinus infections can result from fluid accumulating in the blocked sinuses..