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(a) The supraorbito-meatal line on a skull X-ray passes through the most anterior point of the superior wall of the orbital cavity (white arrow) and the center of the external auditory meatus (black arrow). (b) The illustration of the midsagittal image shows that the landmarks of the supraorbito-meatal line are the center of the mammillary body (solid arrow) and the fastigium of the fourth ventricle (dotted arrow).
