To compare presurgical motor mapping by navigated transcranial magnetic stimulation for surgery (nTMS) of rolandic lesions to surgery with mapping without implementing these data into neuronavigation as control.

Primary objective: Permanently new postoperative deficit is lower when the preoperative motor mapping is available to the surgeon

Experimental intervention:

presurgical motor mapping by navigated transcranial magnetic stimulation and fusion with intraoperative neuronavigation

Control intervention:

presurgical motor mapping by navigated transcranial magnetic stimulation without access of the surgeon to this data Follow-up per patient: 6 months Duration of intervention per patient: 45 minutes

Key inclusion criteria:

• indication for resection of a supratentorial tumor within or adjacent to the primary motor cortex
• preoperative nTMS mapping of the ipsilateral hemisphere
• implementation of the mapping data into preoperative planning
• continuous MEP monitoring - informed consent

Key exclusion criteria:

• no motor eloquent tumor
• infratentorial tumor
• no postoperative imaging
• prognosis lower than 3 months of survival - age <18 years