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  • Title: Craniocervical junction abnormalities with atlantoaxial subluxation caused by ventral subluxation of C2 in a dog.
    Author: Itoh H, Itamoto K, Eto S, Haraguchi T, Nishikawa S, Tani K, Itoh Y, Hiyama M, Iseri T, Nakaichi M, Taura Y.
    Journal: Open Vet J; 2017; 7(1):65-69. PubMed ID: 28540253.
    Abstract:
    Craniocervical junction abnormalities with atlantoaxial subluxation caused by ventral subluxation of C2 were diagnosed in a 6-month-old female Pomeranian with tetraplegia as a clinical sign. Lateral survey radiography of the neck with flexion revealed atlantoaxial subluxation with ventral subluxation of C2. Computed tomography revealed absence of dens and atlanto-occipital overlapping. Magnetic resonance imaging showed compression of the spinal cord and indentation of caudal cerebellum. The diagnosis was Chiari-like malformation, atlantoaxial subluxation with ventral displacement of C2, atlanto-occipital overlapping, and syringomyelia. The dog underwent foramen magnum decompression, dorsal laminectomy of C1, and ventral fixation of the atlantoaxial joint. Soon after the operation, voluntary movements of the legs were recovered. Finally, the dog could stand and walk without assistance. The dog had complicated malformations at the craniocervical junction but foramen magnum decompression and dorsal laminectomy for Chiari-like malformation, and ventral fixation for atlantoaxial subluxation resulted in an excellent clinical outcome.
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