Abstract:

It was an anatomic research on the Retrosigmoid Transsup rameatal Approach (RTA) to remove TypeⅡpetroclival meningiomas. It researched o n 10 adult cadaver heads fixed in 10% formalin and 10 dry human skulls. 10 cadaver heads were examined by bone-window CT scanning before and after operation. Important anatomic structure and position relationship were measured and photographed. For the RTA, the important structures included petrous vei n, inner audition artery and suprameatus. The important data included the scope of the bone window. It suggests that it is the petrous apex maxim um drilling scope, through which the middle fossa part of the tumor could be rem oved. It's characterized by simplicity, security and minimal invasion.

Key words: petroclival region, microsurgical ana tomy, surgical approach, suprameatal ridge