Figure 2d Figure 2e
1 patient with AOA had partial (right) and 15 patients had total assimilation. 4 patients with AOA had OH, 3 had BI, 5 had AC, 1 had ADD, 2 had rotatory AAD, and 3 had MM. 3 patients with AOA had a posterior arch defect in the C1 vertebra (Figure 3 a-c), (Table 1).