Aim: Facial canal dehiscence (FCD) is the most important consideration in the cholesteatoma surgery. The tympanic portion is the most common localization of FCDlization in the majority of cases. MDCT is the standardt imaging modality for temporal bone screening. In this study we aimed to compare coexisting the radiological and - surgical findings of patients who have were found during surgery to have FCD in surgery. Material and Method: We examined retrospectively 351 patients with cholesteatoma who have been were operated on between April 2011 and April 2016. In terms off or this study FCD, we compared the preoperative temporal bone MDCT and the surgery findings of 64 patients with FCD. Results: Positive surgical findings included external auditory canal (EAC) destruction (31.2%), FCD (100%), aditus ad antrum widening (A) (57.8%), ossicular erosion (96.8%), lateral semicircular canal (SSC) defect (18.7%), superior semicircular canal (SSSC) defect (1.5%), and cochlear defect (4.6%). Temporal bone MDCT positive findings included EAC destruction (37.5%), FCD (93.7%), A (82.8%), ossicular erosion (96.8%), SSC defect (18.7%), superior semicircular canal (SSSC) defect (6.2%), and cochlear defect (4.6%). The maximal precision of MDCT imaging in this study was in defining FCD (93.7%), A (82.8%), ossicular erosion (96.8%), and scutum destruction (68.7%). Surgical and CT findings of ossicular chain erosions, A, and SCC fistula showed positive relations inwere positively correlated correlation analyses (p-0.001). Discussion: The significant correspondence between MDCT and clinical findings indicates that MDCT may lead to better a diagnosis of probable likely problems before cholesteatoma surgery, and and to a higherimproves the success rate of cholesteatoma those surgeries. The combined analysis of multi-planar imaging improves the positive diagnosis rate of FCD, especially ion the tympanic portion.