Schmorl node

Schmorl's nodes are protrusions of the nucleus pulposus of the intervertebral disc through the vertebral body endplate and into the adjacent vertebra. Signs and symptoms These are protrusions of disc material into the surface of the vertebral body, which may contact the marrow of the vertebra and lead to inflammation. [Source: Wikipedia ]

Synonyms
Intraosseous herniation of disk
May Cause
Biconcave vertebra
Lytic vertebral lesion
Vacuum disk phenomenon