Itoh Harumichi, Itamoto Kazuhito, Eto Shotaro, Haraguchi Tomoya, Nishikawa Shimpei, Tani Kenji, Itoh Yoshiki, Hiyama Masato, Iseri Toshie, Nakaichi Munekazu, Taura Yasuho
Department of Small Animal Clinical Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi City, Yamaguchi, 753-8511, Japan.
Department of Veterinary Surgery, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi City, Yamaguchi, 753-8511, Japan.
Open Vet J. 2017;7(1):65-69. doi: 10.4314/ovj.v7i1.10. Epub 2017 Mar 25.
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.
一只6个月大的雌性博美犬出现四肢瘫痪的临床症状，被诊断为因C2椎体腹侧半脱位导致的颅颈交界区异常伴寰枢椎半脱位。颈部屈曲位的侧位X线片显示寰枢椎半脱位伴C2椎体腹侧半脱位。计算机断层扫描显示齿突缺如和枕寰重叠。磁共振成像显示脊髓受压和小脑尾侧受压。诊断为Chiari样畸形、寰枢椎半脱位伴C2椎体腹侧移位、枕寰重叠和脊髓空洞症。该犬接受了枕骨大孔减压术、C1背侧椎板切除术和寰枢关节腹侧固定术。术后不久，腿部的自主运动恢复。最后，这只狗可以独立站立和行走。这只狗在颅颈交界区存在复杂畸形，但针对Chiari样畸形进行的枕骨大孔减压术和背侧椎板切除术，以及针对寰枢椎半脱位进行的腹侧固定术取得了良好的临床效果。
