Figure 1.

Midsagittal T2WSE image (A) and postcontrast CT image (B) (soft tissue window) of the brain of the same dog. The supraoccipital bone (red asterisk), basioccipital bone (green asterisk) and occipitoatlantoaxial joint is visible (white asterisk). The foramen magnum limit is set (black line) from the rostrodorsal aspect of the supraoccipital bone to the most caudal aspect of the basioccipital bone. The cerebellar herniation length (mm, white line) is measured caudal from the foramen magnum.