Aim. Development and implementation of a method for determining the boundaries of the resection of the posterior wall of the internal auditory canal (IAC) using bone landmarks of the base of the posterior cranial fossa, which provides the least risk of damage to the structures of the inner ear when removing the intrameatal part of the auditory nerve neuroma.Materials and methods. Structural features of the inner base of the posterior cranial fossa, the inner side of the pyramid of the temporal bone and the internal auditory canal were studied on 160 computed tomograms of patients — men and women aged 18 to 70 years without pathology of the skull and brain. Based on the obtained craniometric data, a method has been developed to determine the boundaries of the resection of the posterior wall of the IAC in order to remove the intrameatal part of the auditory nerve neurinoma. A comparative analysis of the results of surgical treatment of patients with acoustic neurinomas was carried out in 2 groups of patients who underwent surgery with the use of the proposed method (n=8) and traditional one (n=12).Results. It was established that the short wide posterior cranial fossa compared with the narrow one was distinguished by a more massive petrosal part, the IAC was deeper and shorter. The longer the pyramid was, the closer the opening of the internal auditory canal was located to the apex and the median plane. Taking into account the individual characteristics of the structure and location of the internal auditory canal and the labyrinth structures, a method was developed for determining the boundaries of the posterior wall resection of the ASC, which was used in 8 patients who underwent removal of the auditory nerve neurinoma in the neurosurgical department of the Orenburg Regional Clinical Hospital.Conclusion. The use of an individualized method for determining the boundaries of the posterior wall resection of the IAC in surgery of the auditory nerve neurinomas made it possible to significantly increase the accuracy of determining the boundaries and volume of the resection, increase the radicalness of the removal of the tumor, reduce the frequency of damage to the structures of the labyrinth by 2.7 times and to the facial nerve by 2.2 times.