Fig. 1From: Gradient local anesthesia for percutaneous endoscopic interlaminar discectomy at the L5/S1 level: a feasibility studyIllustrated case of a 48-year-old female patient. Preoperative T2-weighted MRI of the lumbar spine showed the prolapse of L5/S1 disc in the sagittal section (a). The axial plane of MRI showed the left S1 nerve root was compromised (b, red arrow)Back to article page