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Purpose: Evaluate a modified cranial vault asymmetry index by measuring the asymmetry of the skull shape with congenital craniosynostosis and by assessing the surgical outcome quantitatively.Discuss its advantages and shortcomings and compare it with the traditional measurement method, cranial vault asymmetry index (CVAI).Method: Based on the traditional cranial vault asymmetry index, anterior cranial vault asymmetry index (ACVAI) and posterior cranial vault asymmetry index (PCVAI) are to be applied in the evaluation of surgical effect.Measure cephalic index (CI)、CVAI、ACVAI and PCVAI on the reconstructed three-dimensional CT images in order to analyze the degree of the malformation and assess the operational effect.Compare the new method with the traditional one, and do a statistical analysis.