Source: translated by jxradiology HW ZHAO
In April 2014, the North American Association of Spine Surgery (NASS), the American Society of Spine Radiology (ASSR), and the American Society of Neuroradiology (ASNR) jointly released the nomenclature of lumbar discs (version 2.0).
1. Normal:
Disc bulge:
Normal intervertebral discs, all within the boundaries shown by the dotted line;
Symmetrical intervertebral disc bulge, fiber ring symmetrical bulge disc boundary less than 3 mm;
Asymmetrical disc bulging, fibrocycular asymmetrical bulging disc margins greater than 25%.
Disc protrusion
Disc herniations are less than 25% (90 degrees) less than the discs, and, in any plane, the maximum measurement of the herniations is lower than the base of the displaced disc source.
IV. Intervertebral Disc Herniation Subtype: Disc extrusion (Disc extrusion)
The maximum measurement of the displaced disc is greater than the base of its source
V. Herniated disc subtype: Disc sequestration
The free disc is a detached disc and has no connection with the source disc.
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