先天性外耳道闭锁听骨链的虚拟耳镜观察

目的：探讨虚拟耳镜对先天性外耳道闭锁听骨链畸形术前评估的作用。方法：23例（28耳）先天性外耳道闭锁、中耳畸形患者，经高分辨率螺旋CT轴位、冠状位颞骨扫描，应用仿真内镜软件行图像三维重建。术前虚拟耳镜结果与手术探查结果进行对比分析。结果：28耳外耳道闭锁、中耳畸形，虚拟耳镜提示25耳听小骨发育不全，3耳狭小鼓室未见听骨。24耳行手术治疗，术中发现锤、砧骨发育不全19耳，镫骨畸形11耳，镫骨缺失3耳，前庭窗闭锁1耳。术前虚拟耳镜观察与术中探查符合率为100％。结论：虚拟耳镜为先天性外耳道闭锁听骨链畸形的术前评估提供了可靠的影像学信息。

Virtural endoscopy view of ossicular chain in the congenital aural atresia

Objective:To investigate the function of virtual endoscopy in assessing ossicular chain deformity in the congenital ear malformation.Method:In 23 cases 28 ears with congenital atresia of external auditory meatus. A high resolution spiral CT is used to display the temporal bone by axial and direct coronal planes. Perspective virtual endoscopy was processed using the virtul endoscopy software.To compare the views of the operative exploration and the virtual endoscopy then draw the responding conclusions.Result:Twenty-eight ears with congenital microtia were showed ossicular deformity in 25 ears, while flache pauke in 3 ears. Twenty-four ears treated by canaloplasty of external auditory meatus and tympanoplasty, hammer and incus hypoplasia in 19 ears, stapes abnormity were demonstrated in 11 ears, ossicles absence in 3 ears, vestibular window clausura in 1 ears.The coincidence between Virtual endoscopy and operating view were 100% in cases with congenital ear defomity.Conclusion:Virtual endoscopy can provide reliable information on the ossicles pathological conditions in congenital congenital aural atresia.