Fig. 14
Focal disc displacement: extrusion with transligamentous sequestration. (a–b) Sagittal T2-WI scans demonstrate a large L4–L5 left-sided sequestered herniation with superior migration of the fragment. The disc material extends beyond the posterior longitudinal ligament margin suggesting its complete rupture. (c) The extruded disc material is round in the axial slides, which is a typical presentation