Individual planning of retrosigmoid approach in surgery of pontocerebellar meningiomas

Abstract

Objective: the method of individual planning of retrosigmoid approach to the pontocerebellar meningiomas taking into account the localization of tumor matrix, growth direction of tumor and configuration of posterior cranial fossa (PCF) was developed aiming the optimization of the parameters of mentioned approach. Material and methods: 8 forms of bone basis configuration of PCF as well as structure features and spatial relationship of petrosal bone were revealed after X-ray data examination of 160 CT scans of patients without neurosurgical pathology Results. The projection analysis of 38 CT scans and angiograms of patients suffered from pontocerebellar meningiomas revealed the features of dislocation of various brain stem structures as well as vascular and neural structures in relation to growth direction of tumor and bone and dura mater configuration of PCF. Conclusion. The method of planning and parameters optimization of retrosigmoid approach based on individual anatomical model of PCF and features of tumor topography was developed. This method allowed increasing the accuracy of surgical approach and lowering the operative trauma and risk of complications.