Imaging findings for Atlanto-occipital assimilation with multiple cervical vertebral anomalies in a Beagle dog: A 2 year follow-up J., Chae M., Eom K. (2020): Imaging findings for Atlanto-occipital assimilation with multiple cervical vertebral anomalies in a Beagle dog: A 2 year follow-up. Veterinarni Medicina, 65: 183-189.
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A 3-year-old male Beagle dog was presented for a physical examination, which revealed a mild stiff neck that was affecting movement. The imaging modalities led to our diagnosis of an asymmetric fusion of the occipital condyle and atlas wing consistent with Atlanto-occipital assimilation (AOA). An incomplete ossification of the atlas and axis, dysplastic dens, and a blocked vertebra were also noted. During a two-year follow-up, the dog showed no other clinical signs or disease progression. To our knowledge, this is the first imaging description of AOA in veterinary medicine. We recommend a careful CT (computed tomography) and an MRI (magnetic resonance imaging) evaluation in cases of neck pain and cervical myelopathy, and inclusion of AOA among the differential diagnoses, with the awareness that its clinical signs resemble those of other canine diseases.

Al-Motabagani MA, Surendra M. Total occipitalization of the atlas. Anat Sci Int. 2006 Sep 1;81(3):173-80.
Cerda-Gonzalez S, Dewey CW, Scrivani PV, Kline KL. Imaging features of atlanto-occipital overlapping in dogs. Vet Radiol Ultrasound. 2009 May-Jun;50(3):264-8.
Ciolkowski MK, Krajewski P, Ciszek B. A case of atlas assimilation: Description of bony and soft structures. Surg Radiol Anat. 2014 Oct 1;36(8):833-6.
Dewey CW, Marino DJ, Loughin CA. Craniocervical junction abnormalities in dogs. N Z Vet J. 2013 Jul 1;61(4):202-11.
Kim KR, Lee YM, Kim YZ, Cho YW, Kim JS, Kim KH, Lee IC. Cervical myelopathy secondary to atlanto-occipital assimilation: The usefulness of the simple decompressive surgery. Korean J Spine. 2013 Sep;10(3):189.
Nimje DA, Wankhede HA. Atlanto-occipital fusion: A rare anomaly of the craniocervical junction. Edorium J Anat Embryo. 2014 Jan 14;1:1-4.
Parry AT, Upjohn MM, Schlegl K, Kneissl S, Lamb CR. Computed tomography variations in morphology of the canine atlas in dogs with and without atlantoaxial subluxation. Vet Radiol Ultrasound. 2010 Nov;51(6):596-600.
Sharma DK, Sharma D, Sharma V. Atlantooccipital fusion: Prevalence and its developmental and clinical correlation. J Clin Diagn Res. 2017 Jun;11(6):AC01-AC03.
Wang S, Wang C, Liu Y, Yan M, Zhou H. Anomalous vertebral artery in craniovertebral junction with occipitalization of the atlas. Spine (Phila Pa 1976). 2009 Dec 15;34(26):2838-42.
Warren-Smith CM, Kneissl S, Benigni L, Kenny PJ, Lamb CR. Incomplete ossification of the atlas in dogs with cervical signs. Vet Radiol Ultrasound. 2009 Nov-Dec;50(6):635-8.
Wrzosek M, Plonek M, Zeira O, Biezynski J, Kinda W, Guzinski M. Congenital bipartite atlas with hypodactyly in a dog: Clinical, radiographic and CT findings. J Small Anim Pract. 2014 Jul;55(7):375-8.
Zaki FA. Odontoid process dysplasia in a dog. J Small Anim Pract. 1980 Apr;21(4):227-34.
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