Watson A G, de Lahunta A
Department of Physiological Sciences, College of Veterinary Medicine, Oklahoma State University, Stillwater 74078.
J Am Vet Med Assoc. 1989 Jul 15;195(2):235-7.
Absence of the transverse ligament of the atlas was diagnosed at necropsy in an 8-month-old Shih Tzu with radiographic signs of atlantoaxial subluxation. Symmetric ataxia, tetraparesis, and signs of pain in the vertebral canal suggested a lesion in the cervical portion of the spinal cord. Necropsy revealed absence of the transverse ligament of the atlas and malformation of dens and atlas. In addition, the alar ligaments were distinct and thick, and the atlanto-occipital and atlantoaxial joint capsules were markedly thicker than normal. Histologic examination revealed focal compressive myelopathy of the spinal cord at the level of the atlantoaxial joint.
一只8个月大的西施犬尸检时被诊断为寰椎横韧带缺失，并有寰枢椎半脱位的放射学征象。对称性共济失调、四肢轻瘫以及椎管内疼痛体征提示脊髓颈部有病变。尸检发现寰椎横韧带缺失，齿突和寰椎畸形。此外，翼状韧带明显且增厚，寰枕和寰枢关节囊明显比正常厚。组织学检查显示寰枢关节水平脊髓有局灶性压迫性脊髓病。
