A limbus vertebra represents herniation of nucleus polposus through a defect in the anterior margin of the vertebral body endplate and beneath the ring apophysis. It is closely related to Schmorl nodes and should not be confused with a limbus fractures or infection.
The anterosuperior corner of a single vertebral body in the mid lumbar spine is most frequently affected. The inferior and posterior margin and other regions are less frequently affected.
The anterior herniation of the nucleus pulposus may cause a separation of a triangular smooth bone fragment which apparently represents the ring apophysis.
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