[Microsurgical anatomy of cholesteatoma of posterior cranial fossa].

Microtopographical interrelations of the posterior cranial fossa structures in the presence of cholesteatoma were studied up intraoperatively in 36 cases and while the pathomorphological investigation conduction in 6 sectional observations. Cholesteatoma mostly localizes in cerebellopontile angle and more rarely--in the IV ventricle with craniospinal spreading. It is the tumor's capsule texture what causes dense adherence of cholesteatoma with surrounding cranial nerves, vessels, incorporated frequently in her structure together with underlying cerebral substance.