A Modified Translaminar Osseous Channel-Assisted Percutaneous Endoscopic Lumbar Discectomy for Highly Migrated and Sequestrated Disc Herniations of the Upper Lumbar: Clinical Outcomes, Surgical Indications, and Technical Considerations

Figure 4

Comparison of magnetic resonance imaging (MRI) findings before and after surgery. Preoperative sagittal plane T2-weighted MRI showing highly upmigrated and sequestrated disc herniation fragments at the L1-L2 level. Postoperative sagittal plane T2-weighted MRI of the same patient demonstrating complete removal of the L1-L2 disc protrusion fragments.