Abstract : Nasal deviated septum is a predisposition factor in the occurrence of rhinosinusitis. If there is obstruction in the ostium sinus can interfere with the airflow, so that in the long term it will cause rhinosinusitis. nasalAccording to Mladina classification of nasal septum is divided into 7 types, one of which is Mladina type III classification which is deviation in the media konka of Osteomeatal complex (KOM).nasalThe research aims to determine the difference in the risk factors of the classification of the type III nasal septum Mladina with the incidence of Maxosinusitis Macsilaris and Ethmoidalis rhinosinusitis. Case control analytical observational research using medic record data with poly ENT-KL patients undergoing CT-Scan examination in poly radiology of Sultan Agung Islamic Hospital in October-December 2016. Of the 44 patients with nasal complaints conducting CT-Scan SPN differentiated into 4 groups namely: subjects with risk factors that experienced effects, subjects with risk factors that did not experience the effects, subjects without the risk factors that experienced the effects, and subjects Without any adverse risk factors. The results of the Odds Ratio (OR) analysis indicate the value of OR = 7,500 with IK 95% 1.854 – 30.335 indicating that the nasal septum deviation of Mladina type III is a risk factor in the incidence of maxosinusitis macsilaris with a probability of 7.5 times greater Compared with the incidence of rhinosinusitis ethmodalis with odd ratio (OR) 6.3 times for the incidence of rhinosinusitis. It was concluded that the septum deviation of Mladina type III is more at risk of undergoing maxilaris rhinosinusitis compared to Ethmoidalis rhinosinusitis