Adenoidectomy surgical removal of the adenoids for reasons which include impaired breathing through the nose, chronic infections, or recurrent earaches.The surgery is less commonly performed in adults in whom adenoids are considered vestigial and purposeless.It is most often done on an outpatient basis under general anesthesia. Post-operative pain is generally minimal and reduced by icy or cold foods.he surgery is less commonly performed in adults in whom adenoids are considered vestigial and purposeless. It is most often done on an outpatient basis under general anesthesia. Post-operative pain is generally minimal and reduced by icy or cold foods.