목적: Preoperative assessment of neuroimaging studies is critical for characterizing the morphological characteristics of the sphenoid sinus, sellar floor, tuberculum sellae, and clivus. A complex sphenoid sinus configuration may make intraoperative correlation substantially more challenging. The authors aimed to characterize neuroimaging and intraoperative variations in the sagittal and coronal surgical anatomy of patients with sellar lesions. 방법:Between February 2009 and March 2014, anterocentral skull-base tumors including pituitary adenoma underwent operations via EETSA. We retrospectively reviewed imaging studies and patients medical records. Preoperative CT sans were reviewed in the coronal and saggital planes. The presence and number of sphenoid intersinus septations and pneumatization of sphenoid sinus were recorded. 결과:Of the 108 patients studied, the sphenoid sinus is to have a variable pneumatization pattern, with 98.14% well penumatized (sellar) and 1.85% poorly penumatized (conchal). 7 patients had no interseptations. Location of intersinus septations were vertical 82.17% midline (36.14%), right (25.3%), left (24.09%) right and left (12.04%) and horizontal parallel to coronal plane 17.82%. There were no dehiscence of carotid canal and canal of optic nerve. 결론:An understanding of the regional anatomy and its variability can improve the safety and accuracy of transsphenoidal and extended endoscopic skull base approaches. The intersinus septum which is horizontal is important to make correct view for EETSA.