Table 2.
Surgical details.
| ID | IONM |
Duration (min) |
EOR |
|||||
|---|---|---|---|---|---|---|---|---|
| Technique | Approach | Event | Surgery | ioMRI | IONM - DWI | ioMRI | 2nd resection | |
| 1 | TES | F | Loss | 214 | 69 | 58 | GTR | – |
| 2 | DCS | F-T-P | Loss | 292 | 65 | 60 | GTR | – |
| 3 | TES | P–O | Loss | 253 | 67 | 57 | STR | – |
| 4 | TES | F-T | Loss | 266 | 70 | 66 | GTR | – |
| 5 | TES | F | Loss | 159 | 70 | 40 | GTR | – |
| 6 | DCS | F-T-P | Loss | 174 | 69 | 57 | GTR | – |
| 7 | TES | F | Decline | 289 | 70 | 84 | STR | GTR |
| 8 |
TES |
F-T |
Loss |
263 |
65 |
82 |
GTR |
– |
| P |
.2333 |
.6422 |
<.0001 |
.8295 |
.0095 |
– |
>.9999 |
.7333 |
| 9 | TES | F-T | No | 285 | 80 | – | GTR | – |
| 10 | TES | F | No | 359 | 84 | – | GTR | – |
| 11 | TES | F | No | 232 | 84 | – | STR | GTR |
| 12 | TES | F-T | No | 266 | 76 | – | GTR | – |
| 13 | TES | F-T-P | No | 229 | 80 | – | STR | STR |
| 14 | TES | F | No | 253 | 73 | – | GTR | – |
| 15 | TES | F | No | 125 | 40 | – | GTR | – |
| 16 | TES | F-T | No | 213 | 86 | – | GTR | – |
The table shows surgical details of all included patients (IONM = intraoperative neuromonitoring, TES = transcranial electrical stimulation, DCS = direct cortical stimulation, ioMRI = intraoperative magnetic resonance imaging, IONM – DWI = time between loss or decline of motor evoked potentials and start of DWI sequences, EOR = extent of resection, GTR = gross total resection, STR = subtotal resection; decline of IONM was defined as a decrease of >50% of the motor evoked potential amplitude in comparison to baseline). Column 3 describes the surgical approach decisive for the application of TES or DCS and used for tumor resection (F = frontal, F-T = fronto-temporal, F-T-P = fronto-temporo-parietal, P–O = parieto-occipital).