Fig. 1Preoperative (A) coronal T2-weighted and axial T2- and (B) T1-weighted magnetic resonance images showing compressed nerve root, and root was not identified on the right side at the L5-S1 level (sacral ala area).
Fig. 2Preoperative (A) coronal T2-weighted and axial T2- and (B) T1-weighted magnetic resonance images collapsed nerve root canal on the right side at the S1 foramen.
Fig. 3This figure shows (A) the skin incision and (B) bony fragment around the compressed nerve root.