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Figure 1: The primary axis (PA) connects the dorsum sellae and the fourth ventricular hill. The pons ratio (PR) is the ratio of the height of the pons above the PA (A) to the entire pons (B)

Figure 1: The primary axis (PA) connects the dorsum sellae and the fourth ventricular hill. The pons ratio (PR) is the ratio of the height of the pons above the PA (A) to the entire pons (B)