HÌNH ẢNH CẮT LỚP VI TÍNH VÀ CỘNG HƯỞNG TỪ CÁC TYPE THIỂU SẢN ỐC TAI

Abstract

Objective: to describe CT canner and MRI imaging of cochlear hypoplasia. Material and Methods: 24 patients were diagnosed with cochlear hypoplasia, they were performed computed tomography and magnetic resonace. Inner ear malformation and cochlear nerve deficency was evaluated on high resolution CT scanner and high resolution T2 3D gradient-cho MRI 1.5 Tesla. Results: 24 patients with 45 ears, there were 10 ears type I, 14 ears type II, 14 ears type III, and 7 ears type IV. The size of basal turn of cochlear in type II, III, anh IV is hypoplastic, but there is no difference between them. 68.9% of cases have aplasia and hypoplasia of cochlear aperture and 60% of case have cochlear nerve aplasia. 100% of type II, III, and IV have hypoplasia modiolus. Hypoplasia and aplasia round window account for 66.7% of case. Conclusion: The size of basal turn of cochlear in type II, III, anh IV is hypoplastic. Cochlear aperture aplasia, cochlear aperture hypoplasia and cochlear nerve aplasia are found in most cases of cochlear hypoplasia. Cochlear aperture aplasia and hypoplasia are mainly found in type III, cochlear nerve aplasia is most common in type I. Modiolus hypoplasia in all case of type II, III, anh IV, aplasia in type I. Hypolplasia or aplasia round window are common, that are factors cause difficulties for cochlear implant surgery.