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Congenital abnormalities in different patients. (A) Butterfly vertebra; (B) hemivertebra; (C) vertebral block. Complex abnormalities in Klippel Feil (D) and Jarcho-Levin (E) syndromes. (F) Kyphotic deformity secondary to anterior failure of vertebral body formation. Arrows point the main abnormality in each case.
