Intra- and interobserver variability was very good to excellent.Ĭonclusion and Clinical Relevance: There are significant differences in area and length ratios between dog breeds. Mean length ratios were statistically different between all cervical locations, except C2/C3 compared to C3/C4. Regarding length ratios, results from Chihuahuas were significantly different than all breeds except Dachshunds. Mean area ratios were statistically different between the cranial and caudal cervical vertebral locations. Mean area ratio of Chihuahuas was significantly larger than all other breeds, while results from Dachshunds were only significantly different than Chihuahuas and Labrador Retrievers. Results: There were significant differences for disk to vertebral body area and length ratios between evaluated dog breeds and cervical vertebral locations ( p < 0.001). Inter and intra observer variability was assessed. Additionally, sagittal vertebral body and disk length measurements were obtained and disk to vertebra length ratios calculated. Disk to vertebra area ratios were calculated and compared among dog breeds. Procedures: Mid-sagittal measurements of vertebral body and disk areas were obtained from C3 through C7 vertebrae and C2/C3 through C6/C7 intervertebral disks. Sample: Retrospective evaluation of cervical vertebral column magnetic resonance imaging studies of 44 dogs representing 5 different breeds (Labrador Retriever, n = 10 French Bulldog, n = 10 Great Dane, n = 9 Chihuahua, n = 10 Dachshund, n = 5). Objective: To establish sagittal area and length reference values and ratios between apparently normal canine cervical vertebrae and intervertebral disks using magnetic resonance imaging. 3Department of Production Animal Studies, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa.2Division of Clinical Radiology, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland.1Division of Small Animal Surgery, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland.Pia Düver 1 Christina Precht 2 Geoffrey Fosgate 3 Franck Forterre 1 Bianca Hettlich 1 *
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