Abstract
ABSTRACT Recurrent laryngeal neuropathy (RLN) etiology can be acquired, iatrogenic or idiopathic. There are no previous reports of RLN caused by recurrent laryngeal nerve compression by melanomas. This report describes a horse presenting severe dyspnea and progressive weight loss. Physical exam demonstrated tachycardia, tachypnea, inspiratory dyspnea at rest, neck extension and mydriasis. Temporary tracheotomy was performed and videoendoscopic examination diagnosed grade IV laryngeal paralysis. The animal came suddenly to death by suppurative bacterial pneumonia. At necropsy, it was possible to observe multiple melanotic epithelioid melanoma nodules compressing the recurrent laryngeal nerve, alongside with lung and parotid metastasis. This finding emphasizes the importance of establishing a differential diagnosis for tumor mass compression in the etiology of RLN, especially melanomas in gray horses, with or without cutaneous manifestations of masses.
Highlights
There are no previous reports of Recurrent laryngeal neuropathy (RLN) caused by recurrent laryngeal nerve compression by melanomas
It was possible to observe multiple melanotic epithelioid melanoma nodules compressing the recurrent laryngeal nerve, alongside with lung and parotid metastasis. This finding emphasizes the importance of establishing a differential diagnosis for tumor mass compression in the etiology of RLN, especially melanomas in gray horses, with or without cutaneous manifestations of masses
Laryngeal paralysis is related to any potential damage to the vagosympathetic trunk, especially those affecting the guttural pouches, the neck, and cranial portion of the thorax
Summary
Recurrent laryngeal neuropathy (RLN) is a welldocumented clinical condition in young racehorses (Dixon et al, 2003; Kraus et al, 2003; Brown et al, 2004; Taylor et al, 2006; McCarrel and Woodie, 2015), especially in racing Thoroughbreds, leading to decreased performance (Hackett et al, 1991; Martin et al, 2000; Russel and Slone, 1994; Stick et al, 2001). Better visualization and count of atypical mitosis were impaired by the intense amount of pigmentation of the neoplastic cells
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