MRI findings may help predict AAI surgery outcomes in small dogs

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A new retrospective study in Animals suggests preoperative MRI findings may help veterinarians better gauge which small dogs are more likely to have less favorable outcomes after surgical correction of atlantoaxial instability, a congenital craniocervical disorder seen most often in toy and small breeds. The study reviewed 20 dogs treated at Kasetsart University Veterinary Teaching Hospital between January 2017 and December 2025 and found that older age, more severe ventral spinal cord compression on MRI, and the presence of syringomyelia were associated with worse neurologic status or less favorable surgical recovery. The cohort was made up mostly of Chihuahuas and Pomeranians, with a median body weight of about 2.1 kg. (sciety.org)

Why it matters: For veterinary professionals, the paper adds nuance to a condition where surgery is often recommended, but prognosis can vary widely. Prior literature has shown that many dogs improve after stabilization, including one 49-dog series in which 46 of 47 dogs with follow-up improved neurologically, but this newer report suggests MRI may do more than confirm diagnosis, it may also help identify concurrent changes such as syringomyelia and quantify cord compression before counseling pet parents on expected recovery. That could be especially useful in referral neurology and surgery settings, where case selection, imaging interpretation, and expectation-setting are central to care planning. (pubmed.ncbi.nlm.nih.gov)

What to watch: Whether larger, multicenter studies validate syringomyelia and MRI-based compression measures as reliable prognostic markers for AAI surgery in small dogs. (sciety.org)