Fig. 7

A case presentation for very-highly downward-migrated herniation. (a): The preoperative sagittal MRI showing a very-highly down-migrated fragment along the posterior L4 vertebra; (b): The preoperative axial MRI showing the migrated fragments hidden in the L4 medial pedicle; (c), (d): The postoperative sagittal and axial MRI showing that the fragments were completely retrieved, the L4/5 disc was maintained intact; (e), (f): The postoperative sagittal and axial CT showing the partial pediculectomy, while there is no pedicle fracture