butterfly vertebra

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but·ter·fly ver·te·bra

a hemivertebra or sagittally cleft vertebra that has a butterfly configuration on frontal radiographs; congenital in origin.
Farlex Partner Medical Dictionary © Farlex 2012
A term for a congenitally anomalous vertebrum accompanied by persistence of the fetal notochord remnant due to incomplete embryologic notochord regression, or chorda dorsalis; sagittal clefts appear, causing a characteristic ‘pinching’ of the superior and inferior aspects of the body and compensatory overgrowth of the vertebral bodies above and below the affected bone
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.