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Measurements in axial CT images. a Mastoid size A anterior-posterior (AP) size, measured in the middle of the external meatus (cranial/caudal) as the minimal distance from the external meatus to sigmoid sinus B lateral-medial (LM) size, distance between outer cortex and sigmoid sinus, measured perpendicular to A. b Angle cochlear basal turn. c Vestibulum size A longitudinal extension, B transversal diameter (right ear)
