Microsurgical anatomy of the subtemporal transdural approach to the petroclival region

Abstract

Objective To explore the anatomical structure and identify the safe resecting region in the temporal base approach of transpetrosal subdura.To explore ways to grind petrous bone easily.Method The subtemporal approach was simulated in 10 （ 20 sides ） formalin - fixed cadaveric adult heads to observe the grinding of the bone.The results of observation were photographed and measured to provide the safe range of the grinding petrous bone.Results As a symbol of the auditory canal, bone was divided into the part of around the internal auditory canal and the petrous apex.The bone around the internal auditory canal was devided into the lateral internal auditory canal and upper part.Distance of about 5 mm to the internal auditory canal could be grinded.The yard of the inside petrous apex could be grinded safly.Grinding the subdural bone could increase the vertical angle up to 15°.Conclusions The subtemporal tentorial approach can increase the view on the structure of the posterior fossa.It gives the priority exposure for the base of posterior fossa tumors. Key words: Petroclival region; Dissection; Surgical approach