Overview Most common type of congenital deformities which result from vertebral malformation during the gestational period. Family history is rare: 13/1,250 Patients positive F-Hx (Winter, 1983). They are grouped as: Isolated Anomalies: No Genetic Risk (Wynne Davies, 1975) Complex Anomalies: 5-10% Risk Two main types of malformation are described and include formation and segmentation defects. […]