Control of bone hemostasis using bone wax is convincing. Around the prolapsed brain from the previous trepanation, a bone bridge was formed, which was also resected using Kerrison pliers. In the opened field, cyanotic, slightly protruding outward relative to the bone window, dura mater is visible, with traces of brain detritus, thrombotic masses and purulent film. The dura mater was opened for the purpose of subsequent sail plasty using the Xeno Dura implant, to provide a larger useful volume of the intracranial cavity for the purpose of subsequent prevention of wedging