Fig. 1.

Cranial vault asymmetry index (CVAI) was calculated using caliper (A). The cranial diagonal diameter was measured on unaffected (a) and affected sides of skull (a>b). Cranial vault asymmetry (CVA) is defined as the difference between the cranial diagonal diameters (a-b) divided by long cranial diagonal diameter (a); and CVAI is CVA multiplied by 100. An occipital angle was measured on ultrasound image in unaffected (B) and affected skull (C). A straight line between the two end points was drawn along the calvaria on the left and right sides of the lambdoid suture (arrow). The occipital angle was defined as the angle between straight lines that was drawn from each end point of the lambdoid suture along the skull. The occipital angle was 167° at unaffected (B) and 184° at affected skull (C).