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Chronic Atlanto-Occipital Subluxation in a Labrador Retriever
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Atlanto-axial subluxations are commonly seen as a hereditary problem in small and toy breed dogs, but Labrador Retrievers are normally not affected. This case report describes clinical signs and therapy in a case in which not only the breed but also the age of onset is unusual - and which was caused by a trauma.
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A 6-year-old Labrador retriever-cross was evaluated for an abnormal gait and head carriage 6 weeks after suffering trauma.
The dog was presented with an ambulatory tetraparesis and was reluctant to move his head.
Myelography and computed tomography demonstrated a subluxation of the atlanto-occipital joint with compression of the spinomedullary junction and the brain stem by the occipital bone.
Removal of the compressive part of the occipital bone resulted in improvement of the clinical signs within 6 weeks, and resolution of clinical signs occurred 8 months after surgery.
Source: Helena Rylander, Juan Carlos Robles (2007): Diagnosis and Treatment of a Chronic Atlanto-Occipital Subluxation in a Dog. In: Journal of the American Animal Hospital Association 43:173-178 (2007)
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