颅中窝径路内耳道 ( IAC)手术的关键是准确定位 IAC。然而 IAC隐蔽而狭小 ,道内及毗邻结构复杂而繁多 ,因此往往很难定位。本文的目的在于借助 CT这种特殊的检查手段 ,寻找一种准确、可靠、安全、简便易用、副损伤小的颅中窝径路的 IAC定位方法 ,从而为临床耳神经外科提供理论? The key to intracranial midfed canal approach is to locate IAC accurately. However, the IAC is covert and narrow, with complex and numerous structures in and around the road, so it is often difficult to locate it. The purpose of this article is to provide a theory for the clinical otological neurosurgery with the help of CT, a special inspection method to find an accurate, reliable, safe, easy-to-use and less-invasive IAC location method for the cranial fossa.