정상 와우를 가진 외측반규관 이형성증 1예: 나선형 고해상도 측두골 전산화단층촬영 영상을 이용한 3차원 컴퓨터 영상재건을 통한 진단

When compared with anomalies of the external and middle ear, congenital anomalies of the inner ear present a clinical problem for diagnosis because the inner ear structures can not be observed directly. Since the structures, such as cochlea, semicircular canals, facial nerve, and ossicles, have a complex relationship in the temporal bone, it is difficult to describe their exact spatial relationships by conventional computed tomography. In recent years, three-dimensional recontruction technique based on images from high-resolution computed tomographs (HRCT) permits more reliable and definitive description of these structures. We experienced one rare case of lateral semicircular canal dysplasia with normal cochlea development. Three-dimensional recontructed images based on HRCT represented an isolated lateral semicircular canal dysplasia in detail. Thus, we report this case with a review of the literature. (J Clinical Otolaryngol 2004;15:150-153)