Hello, The midline bone in the nose seperating the nostrils is called the nasal septum. 80 percent of all nasal septums are estimated to be off centre and are not generally noticed unless with cold or breathing problems. Recurrent cold may cause inflammation and thereby thickening of the nasal mucosal lining which has in your case been evidenced as Bilateral mild maxillary thickening. It is characteristic of Rhinitis which can be allergic in nature as in most. A severely deviated nasal septum may cause nose blocks and especially so when associated with nasal polyps and/or adenoids. A DNS corrective surgery would be advisable if it is gross since the other causes (allergic causes) and tendency for polyps would need internal medicines apart from corrective surgery. It would be good to understand that a surgical procedure only takes care of the presenting complaint and does nothing to prevent the recurrence of the same in future.