Peer-reviewed veterinary case report
Brain imaging changes in dogs with degenerative myelopathy
By Lewis, Melissa J et al.·Published in Journal of veterinary internal medicine·2021·Department of Veterinary Clinical Sciences, United States·View original on PubMed →
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Original publication title: Brain diffusion tensor imaging in dogs with degenerative myelopathy.
- Species:
- dog
Plain-English summary
A 9-year-old dog with degenerative myelopathy (DM) was studied to understand brain changes associated with this condition. Researchers used a special imaging technique called diffusion tensor imaging (DTI) to look for differences in brain structure between dogs with DM and healthy dogs. They found no significant differences in brain imaging results between the two groups, and the imaging did not correlate well with the dogs' ability to walk. This means that DTI may not be a useful tool for tracking the progression of DM in dogs or assessing its severity.
People also search for: dog degenerative myelopathy symptoms · DTI imaging for dogs · how to help my dog with DM · dog walking problems treatment
Abstract
BACKGROUND: Degenerative myelopathy (DM) in dogs shares similarities with superoxide dismutase 1-associated human amyotrophic lateral sclerosis (ALS). Brain microstructural lesions are quantified using diffusion tensor imaging (DTI) in ALS patients. OBJECTIVE: Characterize brain neurodegenerative changes in DM-affected dogs using DTI. ANIMALS: Sixteen DM-affected and 8 control dogs. METHODS: Prospective observational study. Brain DTI was performed at baseline and every 3 months on DM-affected dogs and compared to controls. Fractional anisotropy, mean diffusivity, axial diffusivity, and radial diffusivity were calculated on specified regions of interest. Gait scores (0, normal to 14, tetraplegia) were assigned at each scan. Diffusion tensor imaging values in DM-affected dogs were compared to controls, gait scores, and evaluated over time. RESULTS: Mean age was 5.7 years (SD 3.2) in controls and 9.7 years (SD 1.4) in DM-affected dogs. In DM-affected dogs, mean baseline gait score was 4 (SD 1), and mean score change from baseline to last scan was 4.82 (SD 2.67). Nine dogs had ≤3 scans; 7 had >3 scans. Accounting for age, no differences in DTI indices were identified for any brain or proximal spinal cord regions between DM-affected dogs and controls (P > .05). Diffusion tensor imaging values poorly correlated with gait scores (R < .2). No significant changes were identified in diffusion indices over time (P > .05). CONCLUSIONS AND CLINICAL IMPORTANCE: Diffusion tensor imaging indices did not differentiate DM-affected from control dogs, detect longitudinal changes, or differentiate disease severity. Findings do not yet support brain DTI as an imaging biomarker.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/34410026/