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Musculoskeletal Imaging

Butterfly vertebra

constriction of the vertebral body centrally, probably after incomplete fusion of two chondral centres with hypoplasia at the junctional site (Fig.1). Butterfly vertebra can result from a developmental abnormality leading to regression of the cauda dorsalis and formation of sagittal clefts in the vertebral body. A funnel-like defect divides the vertebra into right and left halves. Alternatively, a similar appearance can be seen in spinal trauma.

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Fig.1

AP radiograph of the thoracic spine in an anatomic specimen demonstrates constriction of the T10 vertebral body. There is hypoplasia at the junctional site dividing the vertebra into right and left halves. (Courtesy of Guerdon Greenway, MD, Dallas, TX)
Butterfly vertebra, Fig.1