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 | ||||||
| N | Age (y)/sex | Tumour | Location | 1: 2.5 cm behind bregma (SMA) | 2: 2 cm behind stimulation site 1 (precentral gyrus) | 3: 4 cm behind stimulation site 1 (postcentral gyrus) |
| 1 | 59/M | meningioma | frontal | 0.39 mV | 0.38 mV | 0.07 mV |
| 2 | 54/M | glioma | parietal | 0.20 mV | 0.50 mV | 0.44 mV |
| 3 | 64/M | glioma | frontal | 0.28 mV | 3.89 mV | 0.30 mV |
| 4 | 26/M | glioma | frontal | 0.03 mV | 0.20 mV | 0.07 mV |
| 5 | 75/F | metastasis | parietal | 0.43 mV | 1.14 mV | 0.56 mV |
| 6 | 77/M | meningioma | parietal | no CMAP | 6.12 mV | 5.45 mV |
| 7 | 49/F | meningioma | parietal | no CMAP | 3.33 mV | no CMAP |
| 8 | 39/M | glioma | frontal | 0.01 mV | 5.27 mV | no CMAP |
| 9 | 52/F | meningioma | frontal | minimal signal | 0.17 mV | no CMAP |
| 10 | 32/M | glioma | frontal | no CMAP | minimal signal | no CMAP |
| 11 | 39/F | glioma | frontal | no CMAP | 0.9 mV | no CMAP |
| 12 | 61/M | glioma | frontal | no CMAP | 0.05 mV | no CMAP |