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Background  Osseous‐associated cervical spondylomyelopathy (OA‐CSM) is a complex disorder with limited long‐term survival. The longitudinal progression is currently unknown.    Objective  To describe changes on magnetic resonance imaging (MRI) over a 2‐year minimum period. We hypothesized that spinal lesions would progress in the majority of dogs.    Animals  Eleven dogs previously diagnosed with OA‐CSM were prospectively studied. Nine dogs were treated medically, whereas 2 were treated surgically.    Methods  Clinical and MRI follow‐up were performed with a median time between MRI studies of 30 months (range, 24‐54). Morphologic assessment evaluated vertebral canal stenosis, spinal cord compression, foraminal stenosis, and articular processes, among other variables. Morphometric assessment included vertebral canal area, spinal cord area, area of the articular processes, and foraminal height.    Results  On follow‐up MRI, the most affected site at the initial examination in medically treated dogs had progressed in 4 of 9 dogs, improved in 4, and was unchanged in 3. Clinically, all dogs except 2 medically treated dogs were unchanged to improve at follow‐up. Initially, 50 of 60 (83.3%) intervertebral spaces had vertebral canal stenosis, whereas in the follow‐up MRI 82.3% did. Of the sites with stenosis, 45.7% were unchanged, 18.6% improved, and 38.9% worsened. Morphometry identified significant decreases in vertebral canal and spinal cord areas at C4‐C5 through C6‐C7, and significant progression of articular process irregularities at C3‐C4 and C6‐C7.    Conclusions and Clinical Importance  This long‐term follow‐up study of dogs with OA‐CSM did not identify clinical or MRI progression of lesions in the majority of dogs.

Long‐term clinical and magnetic resonance imaging follow‐up of dogs with osseous‐associated cervical spondylomyelopathy