Complex central nervous system malformations in a Dutch Warmblood foal.
Authors: Louie Elizabeth Williams, Streeter Ron, Story Melinda, Scrivani Peter V, Barrett Myra, Mullen Kathleen R
Journal: Journal of veterinary internal medicine
Summary
# Editorial Summary A Dutch Warmblood colt presenting with recumbency, incoordination and intention tremor at birth underwent comprehensive MRI evaluation, which revealed multiple concurrent CNS malformations including a unilateral infratentorial arachnoid cyst with cerebellar compression, corpus callosum agenesis, polymicrogyria and suspected leukoencephalopathy alongside a non-compressive occipito-atlantal malformation. Although the foal demonstrated measurable neurological improvement over the first 6 months of life—suggesting greater neuroplasticity than typically assumed—significant functional deficits persisted, rendering competitive athletic performance highly unlikely. This case highlights an important diagnostic and prognostic gap in equine neonatology: many foals with suspected congenital neurological disease are euthanised before their natural clinical trajectory can be documented, limiting our understanding of long-term outcomes and quality of life in these animals. The authors advocate for wider accessibility and use of MRI in neonatal foals with early-onset neurological signs, as precise anatomical characterisation enables informed decision-making regarding euthanasia versus ongoing management rather than relying on presumptive diagnosis alone. The findings suggest that whilst survival with complex CNS malformations is biologically feasible, veterinary and owner discussions must centre on realistic functional expectations beyond athletic use.
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Practical Takeaways
- •Consider MRI imaging for neonatal foals with neurological signs, as it provides definitive diagnosis of congenital CNS malformations and can guide realistic prognostic counseling.
- •Complex congenital neurological malformations do not always require immediate euthanasia; some foals show clinical improvement over time, warranting cautious optimism during early hospitalization.
- •Communicate clearly with owners that even foals with significant improvement in clinical signs will likely not achieve athletic soundness due to underlying structural CNS abnormalities.
Key Findings
- •MRI identified multiple complex CNS malformations in a neonatal foal: unilateral infratentorial arachnoid cyst-like lesion, absent corpus callosum, polymicrogyria, suspect leukoencephalopathy, and noncompressive occipitoatlantal malformation.
- •Clinical improvement occurred during the first 6 months of life despite severe initial neurological deficits including inability to stand and incoordination.
- •MRI accessibility improved diagnostic accuracy in neonatal foals with suspected congenital CNS malformations.
- •Prognosis for athletic performance remains poor despite clinical improvement, though survival is possible with complex congenital neurological malformations.