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Lateral skull and cranial cervical spinal radiographs in a Griffon Bruxellois with MRI confirmed severe CM and SM (A), a normal Griffon Bruxellois (B), and an Australian terrier (C). The head is in extension as the space between the dorsal atlas and the occiput increases with flexion. A red arrow is placed between the occiput and the dorsal tubercle of the atlas for each dog. The atlas is considerably closer to the skull in the SM affected dog.
