목적: Correction of the caudal septal deviation poses a challenge in even the most experienced hands. In this study, we classified the caudal septal deviation using OMU-CT and evaluated surgical techniques according severity and type of caudal septal deviation. 방법:Ninety-five patients with caudal septal deviation who underwent septoplasty or rhinoseptoplasty and had an OMU CT were included in the study. Coronal views of the OMU CT scan where the caudal septum was most severely deviated were selected and angle of deviation measured. Caudal septal deviation were classified by relationship and anterior nasal crest and general shape and by the measurement of deviated caudal septal angle. 결과:Caudal septal deviation were classified as C-shape with septal dislocation (36patients, 38%), C-shape without septal dislocation(36patients, 38%), linear shape(16patients, 17%), angulation( 7 patients, 8%). 21 patients had 10°or less angle of caudal septal deviation (ASD), 43 patients had more than 10° but less than 20° ASD and 31 patients had 20°or more ASD. Surgical techniques were different significantly according to the severity of septal angulation. In mild and mild cases, the caudal septum was resected at the osseocartilaginous junction and then sutured to the periosteum of the naterior nasal spine. In severe cases, setal batten grafting or cutting and suture technique were preferred. Major complication requiring revision surgery did not exist. 결론:The classification of caudal septal deviation by the shape and severity of angulation can be helpful to correct the caudally deviated septum safely and effectively.