Lumbar disc sequestration mimicking a tumor: Report of four cases and a literature review

Figure 1 Imaging examination of case 1. A: T1-weighted preoperative MRI image showing high signal intensity; B and C: Preoperative T2-weighted image showing low signal intensity, and an axial T2-weighted image demonstrating disc fragments in the left posterior epidural space; D and E: Preoperative contrast-enhanced MRI suggested heterogeneous enhancement; F: Postoperative pathology suggested intervertebral disc tissue; G and H: X-ray on postoperative day 2 indicated intact internal fixation.

Figure 2 Imaging examination of case 2. A: T1-weighted preoperative MRI image showing low signal intensity; B and C: Preoperative T2-weighted image showing low signal intensity, and an axial T2-weighted image demonstrating disc fragments in the right posterior epidural space; D and E: Preoperative contrast-enhanced MRI suggested heterogeneous peripheral ring enhancement; F: Postoperative pathology suggested intervertebral disc tissue; G and H: X-ray on postoperative day 2 indicated intact internal fixation.

Figure 3 Imaging examination of case 3. A: T2-weighted preoperative MRI image showing high signal intensity; B–E: Preoperative contrast-enhanced MRI images showing considerable peripheral enhancement, and an axial image demonstrating disc fragments in the right anterior epidural space; F: Postoperative pathology suggested intervertebral disc tissue; G and H: X-ray on postoperative day 2 indicated intact internal fixation.

Figure 4 Imaging examination of case 4. A: Preoperative T1-weighted MRI image showing moderate signal intensity; B and C: Preoperative T2-weighted image showing high signal intensity, and an axial T2-weighted image demonstrating disc fragments in the right anterior epidural space; D and E: Preoperative contrast-enhanced MRI suggested no obvious enhancement; F: Postoperative pathology suggested intervertebral disc tissue; G and H: X-ray on postoperative day 2 indicated intact internal fixation.