Morphometric magnetic resonance imaging and genetic testing in cerebellar abiotrophy in Arabian horses.
Authors: Cavalleri Jessika M V, Metzger Julia, Hellige Maren, Lampe Virginie, Stuckenschneider Kathrin, Tipold Andrea, Beineke Andreas, Becker Kathrin, Distl Ottmar, Feige Karsten
Journal: BMC veterinary research
Summary
Cerebellar abiotrophy in Arabian horses causes progressive degeneration of Purkinje cells, leading to characteristic clinical signs including head tremor, jerky movements, and absent menace responses, yet MRI's diagnostic utility remains largely unexplored in equine cases. Cavalleri and colleagues performed morphometric MRI analysis alongside genetic testing on five affected horses (four purebred Arabians and one German Riding Pony with Arabian ancestry) to establish imaging markers and confirm the hereditary basis of the condition. MRI morphometry successfully identified cerebellar atrophy in all affected horses, demonstrating that quantitative imaging can objectively support clinical diagnosis where visual assessment alone may prove equivocal, whilst genetic testing confirmed the inherited nature of the disease across the cohort. For practitioners, these findings suggest that MRI should be considered a valuable diagnostic tool in suspected cerebellar abiotrophy cases, particularly where clinical signs are subtle or breed predisposition is known, and that genetic screening offers a means of identifying carriers within breeding programmes. Given the progressive and untreatable nature of CA, establishing definitive diagnosis through imaging and genetic confirmation is essential for informing owners' management decisions and supporting breeding recommendations in Arabian bloodlines.
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Practical Takeaways
- •MRI morphometric analysis can objectively demonstrate cerebellar atrophy and support diagnosis of cerebellar abiotrophy when clinical signs are present, though diagnosis remains challenging
- •Genetic testing should be incorporated into diagnostic protocols for suspected CA cases to confirm hereditary status and guide breeding decisions
- •Arabian horses and related breeds showing progressive ataxia with head tremor warrant neurological investigation including MRI, as CA appears to have a familial pattern
Key Findings
- •MRI morphometric analysis revealed significant cerebellar atrophy in all 5 affected horses with measurable reduction in cerebellar volume
- •Genetic testing identified a hereditary basis for cerebellar abiotrophy in Arabian horses
- •MRI morphometry combined with genetic testing provides supportive diagnostic confirmation of cerebellar abiotrophy beyond clinical signs alone
- •Disease characterized clinically by head tremor, jerky head movements, and absent menace response in affected animals