Comparison of preoperative temporal bone CT findings with the perioperative findings i̇n patients undergoing surgery due to middle ear pathologies

The aim of our study was to investigate the diagnostic confidence level of the presurgical 160-slice CT findings compared with perioperative observational findings about anatomic variations in the structure of the facial canal, lateral semicircular canal and dural plate. 55 patients admitting with middle ear pathology to Afyon Kocatepe University Department of Otolaryngology were included in the study and the mean age was 42(±15,55) . Preoperative images of the temporal bone of the patient was obtained by tomography Toshiba Aquilion One (Toshiba Medial System, Oktavana, Japan). In determining of the facial nerve canal dehiscence sensitivity 52%, specificity 88%, positive predictive value 73%, negative predictive value 75%, in determining of the dehiscence in the tympanic segment sensitivity 50%, specificity 89%, positive predictive value 71%, negative predictive value 76%, in determining of the lateral semicircular canal dehiscence sensitivity 71%, specificity 96%, positive predictive value 71%, negative predictive value 96% and to detecting the presence of dural plate defect Sensitivity 100%, specificity 96%, positive predictive value 50%, negative predictive value of 100% were found. In determining the presence of dehiscence of the facial nerve canal and the tympanic segment by HRCT were observed moderate compatible with surgery. In determining the lateral semicircular canal dehiscence and the presence of defect of the dural plate were observed a good level compatible with surgery.