Histological and ultrastructural evidence that recurrent laryngeal neuropathy is a bilateral mononeuropathy limited to recurrent laryngeal nerves.
Authors: Hahn C N, Matiasek K, Dixon P M, Molony V, Rodenacker K, Mayhew I G
Journal: Equine veterinary journal
Summary
# Editorial Summary: Bilateral mononeuropathy characterisation of recurrent laryngeal neuropathy Recurrent laryngeal neuropathy (RLN) represents a significant peripheral nerve disorder in horses, particularly taller individuals, yet the underlying neuropathological distribution remained poorly defined—specifically whether nerve damage was confined to the recurrent laryngeal nerve or extended to a broader polyneuropathy. Using histological and ultrastructural analysis, Hahn and colleagues examined nerve tissue from RLN-affected horses and found the pathological lesions were exclusively limited to the recurrent laryngeal nerves bilaterally, with no involvement of other peripheral nerves, establishing definitively that RLN is a bilateral mononeuropathy rather than a systemic polyneuropathy. This focused distribution of nerve degeneration is crucial for understanding disease aetiology, as it redirects investigative efforts toward mechanisms specifically affecting the recurrent laryngeal nerve rather than broader systemic factors. For practitioners, this distinction fundamentally shapes how we conceptualise potential causative pathways—whether biomechanical (nerve stretch or compression during neck extension), metabolic (localised nerve-specific factors), or infectious agents—ultimately informing surgical intervention strategies and preventative management approaches in at-risk populations.
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Practical Takeaways
- •RLN is a specific bilateral nerve problem affecting only the recurrent laryngeal nerves, helping clarify the pathological basis for the characteristic respiratory signs seen in affected horses
- •Understanding that RLN is a mononeuropathy limited to these nerves supports targeted investigation into local nerve-specific causes rather than systemic disease processes
- •This finding is particularly relevant for tall horses where RLN is common, allowing practitioners to focus on nerve-specific management strategies
Key Findings
- •Recurrent laryngeal neuropathy is a bilateral mononeuropathy affecting only the recurrent laryngeal nerves, not a polyneuropathy
- •Neuropathological lesions in RLN are limited in distribution to recurrent laryngeal nerve tissues
- •Histological and ultrastructural evidence confirms RLN as a localized nerve disease rather than systemic polyneuropathy