Fig. 6

Comparison of preoperative and postoperative images of the FMM, which is located ahead of the brainstem and superior to the vertebral artery. a–c Preoperative axial, sagittal, and coronal T1-weighted contrast enhanced. d Preoperative 3DCTA and tumor image reconstruction. e–f Preoperative right and left vertebral artery 3DCTA image reconstruction. g–h Postoperative axial and sagittal T1 weighted. i Postoperative axial T2 weighted. j Preoperative tumor, brainstem, nerves, and blood vessels under a microscope. k Postoperative tumor bed, brainstem, nerves, and blood vessels under a microscope. 1, tumor; 2, accessory nerve; 3, vertebral artery; 4, brainstem; 5, C2 nerve; 6, cerebellum; 7, tumor bed