Today’s case is a 17 month old male neutered Shih Tzu mix. It’s had ataxia since 3 months of age with neck pain. What is your radiographic diagnosis?
On multiple projections of the neck, the cranial aspect of C2 is blunted, and there is no evidence of a normal dens. The second cervical vertebra displaced dorsally relative to the first cervical vertebra. On extension of the neck, this distance is moderately reduced. An endotracheal tube is in place secondary to anesthesia.
- Atlantoaxial instability and hypoplasia of the dens
- The atlantoaxial joint was surgically stabilized with 8 screws and polymethylmethacrylate.
- Four weeks later, his neurologic exam was normal.