Transoral atlas-axis X-ray. Skeletal midline—dens axis—spinous process of C2 should be in one single line. In this patient, spinous process of axis is deviated to the right; hence, the axis is rotated to the left. The position of the atlas is measured from the lateral mass of the atlas to the dens axis. The space is increased on the right; hence, the atlas is rotated to the right. The mandibular occlusal plane is inclined. The cranium is rotated to the left; the left eye pupil is lower than the right.