Thoracolumbar surgery for degenerative spine diseases complicated with tethered cord syndrome: A case report

Figure 1 Preoperative radiography. A: Preoperative anteroposterior and lateral radiographs; B: Preoperative flexion–extension radiographs; C: Preoperative computed tomography scan showing block vertebrae at T8/T9 (orange arrow), butterfly vertebra atT9 (blue arrow); D: Preoperative magnetic resonance imaging showing thoracic ossification of the ligamentum flavum (red box), a split cord malformation (blue outline) with a low-lying conus and a thickened terminal filament deposited with fatty tissue, and bilateral nerve root compression at L4-5.