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Musculoskeletal Imaging

Limbus vertebra

a form of cartilaginous node (Schmorls nodes) resulting from a defect in a vertebral body; it is caused by herniation of part of the nucleus pulposus beneath the ring apophysis prior to fusion of the apophysis to the vertebral body. Trauma appears to be responsible for most cases. The distorted interfaces between the intervertebral disc and adjoining vertebral body are well seen on CT scans and MR images (Fig.1). Also, see discography.

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Fig.1

a. Lateral radiograph of the lower lumbar spine demonstrates irregularity of the posteroinferior endplate of L4. b. Axial CT scan shows displacement of disc material into the posteroinferior aspect of the L4 vertebral body. (Courtesy of Roger Kerr, MD, Santa Monica, CA)
Limbus vertebra, Fig.1 (a)
Limbus vertebra, Fig.1 (b)