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Background and Objectives:Lateral semicircular canal (LSC) dysplasia is the most comon congenital anomaly in the iner ear. The LSC dysplasia usualy accompanies other iner ear anomalies, and the concurrent occurrence of the iner ear among patients with middle ear cholesteatoma. Materials and Method:Medical record and temporal bone computed to-mographic (CT) scan of cholesteatoma patients with the LSC dysplasia were analyzed retrospectively. Results:There were four cases of the LSC dysplasia among 262 cholesteatoma patients (1.5%) during five years. Temporal bone CT scan showed short, dilated LSC and enlarged vestibule. The cochlea and the opposite side of the bony labyrinth were normal. All of the the other one patient with Downs syndrome showed profound hearing loss on auditory brainstem response. In the velocity step test, two patients were normal, and one patient showed decreased response in the afected side. Conclusion:This study showed that the LSC dysplasia might be a relatively comon inner ear anomaly encountered on the preoperative CT scan of cholesteatoma patients. The relationship betwen the LSC dysplasia and the development of middle ear cholesteatoma is not clear, and further studies are needed. (Korean J Otolaryngol 2002;45:31-4)


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