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Aims. The aim of this study was to analyse the immediate results of surgical treatment of patients with tumours of the lateral skull base, operated on using an en bloc resection of petrosal bone procedure. Materials and methods. The study included 37 patients operated on for tumours of the lateral skull base in the period from 1992 to 2017. The obligatory study inclusion criterion was intracranial tumour extension. The patients were subdivided into 2 groups. Group 1 included 21 patients with malignant tumours (mainly epithelial tumours and chordomas). Group 2 included 16 patients with benign tumours of aggressive growth: paragangliomas (Fisch D1, Fisch D2, Glasscock-Jackson type IV), meningiomas grade III, giant cell reparative granuloma.) The degree of radicality in the removal of the tumour, incidence of complications and mortality and dynamics of functional state were assessed. Results. The technique of en bloc resection of petrosal bone to the required extent allowed complete resection of the tumour in the majority of cases (71.4%) in patients with malignant tumours (group 1). The oncotomy radicality rate in group 2 was lower (37.5%), which was due to striking the balance between oncotomy extent and reduced risk of postoperative complications on account of feasibility of nonradical removal. The incidence of complications and mortality in our population of patients was 54.1% and 8%, respectively. Conclusions. The obtained results confirm the efficacy and relative safety of en bloc resection of petrosal bone in the surgical treatment of patients with tumours of the lateral skull base.

THE IMMEDIATE RESULTS OF EN BLOC RESECTION OF PETROSAL BONE IN THE TREATMENT STRUCTURE FOR PATIENTS WITH TUMOURS OF THE LATERAL SKULL BASE