Fig. 2

a-g In patient 1, a compact AVM partially involved the left precentral knob. The residual precentral knob and SA were activated during right hand movement (in green). Functionally tracked fiber tract was behind the lesion and located in a normal anatomic pathway (in yellow). h Postoperative DSA shows radical resection. i and j Intraoperative electrical positive stimulation sites were found at cortex (i) and subcortex levels (j) just behind the lesion