Fig. 11

Diffuse displacement of the disc material: bulging and annular folding. (a) Disc bulging. There is a circumferential displacement of the L4–L5 disc (yellow arrows). Nevertheless, the height of the disc is preserved. Note that the focal hyperintensity within the posterior L4–L5 disc is compatible with the annulus fibrous fissure (red arrow). (b) Annular bulging at the C5–C6 level. The nucleous pulposus material has migrated anteriorly (green arrow), emptying the disc and resulting in severe disc space narrowing and the folding of the annulus fibrosus radially outward (red arrow)