No external funding was provided for this work.
IMAGING FEATURES OF ATLANTO-OCCIPITAL OVERLAPPING IN DOGS
Version of Record online: 21 APR 2009
© 2009 American College of Veterinary Radiology
Veterinary Radiology & Ultrasound
Volume 50, Issue 3, pages 264–268, May/June 2009
How to Cite
CERDA-GONZALEZ, S., DEWEY, C. W., SCRIVANI, P. V. and KLINE, K. L. (2009), IMAGING FEATURES OF ATLANTO-OCCIPITAL OVERLAPPING IN DOGS. Veterinary Radiology & Ultrasound, 50: 264–268. doi: 10.1111/j.1740-8261.2009.01531.x
This work has not been presented in a scientific meeting.
- Issue online: 21 APR 2009
- Version of Record online: 21 APR 2009
- Received June 9, 2008; accepted for publication December 3, 2008.
- craniocervical junction;
- magnetic resonance;
The imaging features of four dogs with atlanto-occipital overlapping are described. This malformation appeared to play a role in the development of neck pain, ataxia, variable cerebellar involvement, medullary kinking, and possibly syringomyelia. Using cervical radiographs, three of the four dogs were initially diagnosed with an atlanto-axial malformation. Because this disorder could not account for all clinical signs, magnetic resonance and computed tomography images were also acquired. These provided a more complete evaluation of the craniocervical junction, allowing detection of atlanto-occipital overlapping, medullary kinking, occipital dysplasia, abnormalities of the dens, and syringomyelia in these dogs. Head position during imaging affected the degree of atlanto-occipital overlap. These findings emphasize the need to modify the currently accepted imaging recommendations for dogs with head and neck pain and/or cranial cervical myelopathy. We suggest that the entire craniocervical junction be evaluated, even if atlanto-axial subluxation has already been detected. Moreover, we propose that atlanto-occipital overlapping is a perhaps underrecognized disorder that can influence the clinical signs and therapeutic outcome of dogs with anomalies of the craniocervical junction.