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Figure 2: The clivus-canal angle (CCA) is the angle between Wackenheim's line and a line drawn along the posterior border of the dens (a). The Klaus index (KI) was also calculated. Twining's (TW) line was drawn (b)

Figure 2: The clivus-canal angle (CCA) is the angle between Wackenheim's line and a line drawn along the posterior border of the dens (a). The Klaus index (KI) was also calculated. Twining's (TW) line was drawn (b)