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Congenital anomalies of the spine producing scoliosis are frequently associated with other anomalies. The scoliosis is usually slowly but relentlessly progressive and an unacceptable deformity results if active treatment is not given. Except for the unsegmented unilateral bar, the specific anomaly present was of less prognostic value than the pattern of the curve and the area of the spine involved.
Winter et al. (1968) studied this question.