Fig. 2

Typical case: a A 51-year-old woman presented with low back pain and numbness in her left lower limb for 1 year. Postoperative pathological diagnosis was intraspinal schwannoma. Physical examination showed hypoaesthesia in lateral side of the left leg and dorsum of feet. a, b MRI indicated a space-occupying lesion from T12 to L2 transpinal canal. c Real-object picture of the special retractor. d Posterior paramedian approach combined with inverted V-shaped surgical access. e, f Postoperative X-ray and three-dimensional reconstruction CT suggested that the tumor tissue was completely resected and intervertebral joint was damaged in a small range