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Figure 3: A 16-year-old male with Type II C1–C2 dislocation which is defined as central dislocation or BI (Goel group B type BI) that consisted of pure basilar invagination with a normal atlantodental interval associated with Arnold Chiari malformation. 3D animated clearly showing subtle C1–C2 subtle facet posterior dislocation demands C1–C2 fusion

Figure 3: A 16-year-old male with <i>Type II</i> C1–C2 dislocation which is defined as central dislocation or BI (Goel group B type BI) that consisted of pure basilar invagination with a normal atlantodental interval associated with Arnold Chiari malformation. 3D animated clearly showing subtle C1–C2 subtle facet posterior dislocation demands C1–C2 fusion