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Cephalometric angles. Reference diagram for cephalometric angles. ( A ) Angle of overall anterior skull base (re: 0-degree reference line). ( B ) Angle between the cribriform plate and the planum. ( C ) Angle between the planum and the face of the sella. ( D ) Angle between the planum and the posterior aspect of the clivus. ( E ) Angle between the anterior nasal spine and the superior and inferior aspect of the sphenoid sinus face.
