Fig. 1. Preoperative magnetic resonance (MR) images obtained at level L5-S1. (A) Axial T2-weighted MR image shows a herniated disc effacing both the central and the left foraminal zones. (B) Parasagittal T1-weighted image showing a left L5-S1 foraminal stenosis with perineural fat obliteration surrounding the nerve root compared with adjacent levels.
