block vertebra

Block vertebra is a type of vertebral anomaly where there is a failure of separation of two or more adjacent vertebral bodies. It is an anatomic variant.


In a block vertebra, there is partial or complete fusion of adjacent vertebral bodies.


Radiographic features

  • combined vertebrae may be of normal height, short, or tall
  • disc space is frequently rudimentary or absent
  • the "wasp-waist sign" may be seen in congenital block vertebrae
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