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Figure 1: Demonstrates how measurements were obtained on noncontrast computed tomography head. The clival depth is measured by first creating a horizontal line between the internal auditory canals of each petrous bone, then dropping a perpendicular line to the clivus which is shown in orange. The petroclival angle, shown in green, is an angular measurement created using a horizontal line between the posterior clinoids and another line parallel with the petrous ridge. The petrous Cobb angle, seen in yellow, is also an angular measurement created by drawing parallel lines to the petrous ridge on each side

Figure 1: Demonstrates how measurements were obtained on noncontrast computed tomography head. The clival depth is measured by first creating a horizontal line between the internal auditory canals of each petrous bone, then dropping a perpendicular line to the clivus which is shown in orange. The petroclival angle, shown in green, is an angular measurement created using a horizontal line between the posterior clinoids and another line parallel with the petrous ridge. The petrous Cobb angle, seen in yellow, is also an angular measurement created by drawing parallel lines to the petrous ridge on each side