CONTRIBUTION OF HIGH-RESOLUTION COMPUTED TOMOGRAPHY TO THE DIAGNOSIS OF OTOSCLEROSIS
1SBÜ Prof Dr Cemil Taşcıoğlu Hastanesi, Kulak Burun Boğaz Hastalıkları, İstanbul, Turkey Objective: To demonstrate the contribution of high-resolution computed tomography (HRCT) images obtained preoperatively to diagnosing patients who underwent stapedotomy with a prediagnosis of otosclerosis in our clinic.Materials and Methods: We obtained data on 77 patients who underwent an exploratory tympanotomy with a prediagnosis of otosclerosis. Preoperatively received HRCT images and audiological examinations (pure-tone audiometry and tympanometry) were retrospectively analysed.
Results: HRCT images and audiological examinations of 29 patients that met the study's criteria were documented. According to Marshall's Classification on otosclerotic foci at HRCT, it was found that 55.2% (n=16) of patients had an otosclerosis focus on CT images, i.e., the sensitivity rate of the HRCT on the diagnosis of otosclerosis is 55.2%, statistically. Carhart's Notch was present in 37.9% of the radiologically positive patients (n=11). No statistically significant correlation was found between otosclerotic foci on HRCT and Carhart's Notch on an audiogram (p: 0,624).
Conclusion: While HRCT has low diagnostic accuracy in diagnosing otosclerosis, preoperatively obtained HRCT imaging is still essential for differential diagnosis and evaluation of anatomical variations.
Keywords : Otosclerosis; High resolution computed tomography; Sensitivity