Table 1

Demographic data and motor evoked potential (MEP) findings of 12 patients who underwent focused repetitive transcranial magnetic stimulation (rTMS) for mapping of the rolandic area during brain tumour surgery. The peak amplitudes are written in bold type. With the help of neuronavigation, the underlying cortical anatomy (supplementary motor area (SMA), precentral gyrus, postcentral gyrus) of each stimulation site was determined

Maximum amplitude (mV) of reproducible motor evoked potentials (MEP) in relation to stimulation site 1, 2, and 3
stimulation site
NAge (y)/sexTumourLocation1: 2.5 cm behind bregma (SMA)2: 2 cm behind stimulation site 1 (precentral gyrus)3: 4 cm behind stimulation site 1 (postcentral gyrus)
159/Mmeningiomafrontal 0.39 mV 0.38 mV0.07 mV
254/Mgliomaparietal0.20 mV 0.50 mV 0.44 mV
364/Mgliomafrontal0.28 mV 3.89 mV 0.30 mV
426/Mgliomafrontal0.03 mV 0.20 mV 0.07 mV
575/Fmetastasisparietal0.43 mV 1.14 mV 0.56 mV
677/Mmeningiomaparietalno CMAP 6.12 mV 5.45 mV
749/Fmeningiomaparietalno CMAP 3.33 mV no CMAP
839/Mgliomafrontal0.01 mV 5.27 mV no CMAP
952/Fmeningiomafrontalminimal signal 0.17 mV no CMAP
1032/Mgliomafrontalno CMAP minimal signal no CMAP
1139/Fgliomafrontalno CMAP 0.9 mV no CMAP
1261/Mgliomafrontalno CMAP 0.05 mV no CMAP