Congenital occipitoatlantoaxial malformation in a Warmblood mare
Autor: | Jan M Kümmerle, N Wildhaber, Alois Boos, Maja Ruetten, Seamus Hoey, Hervé P. Brünisholz |
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Přispěvatelé: | University of Zurich, Brünisholz, H P |
Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
medicine.diagnostic_test
Proprioception 040301 veterinary sciences Equine business.industry 10077 Institute of Veterinary Anatomy Radiography 0402 animal and dairy science Magnetic resonance imaging 04 agricultural and veterinary sciences Aplasia Anatomy medicine.disease Spinal cord 040201 dairy & animal science 0403 veterinary science medicine.anatomical_structure Warmblood medicine 570 Life sciences biology Atlanto-occipital joint 10090 Equine Department business 3402 Equine Cervical vertebrae |
Popis: | A 3-year-old Warmblood mare was presented with spinal ataxia of 3 months’ duration. Clinically, reduced mobility of the neck and a prominent atlas were identified. Neurological evaluation revealed hypermetria, circumduction and reduced proprioception, predominantly in the hindlimbs. Occipitoatlantoaxial malformation (OAAM) was diagnosed based on radiography and computed tomography, and confirmed on post-mortem magnetic resonance imaging and pathological examination. Both the atlas and axis were hypoplastic and dysplastic, and a fusion of the atlantooccipital joint was found. A dynamic compression of the spinal cord was present at the first and second cervical vertebrae. Histologically, the spinal cord was degenerated due to compression. Furthermore, there were muscular malformations including a fibrotic obliquus capitis cranialis muscle, aplasia of parts of the rectus capitis muscles and presence of additional abnormal muscle. Such muscular abnormalities associated with OAAM have not been reported yet and this is the first report of a case of OAAM in a Warmblood horse. |
Databáze: | OpenAIRE |
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