Use of intralesional formalin administration for treatment of a subepiglottic cyst in a horse

Abstract

Case Description - A 4-year-old horse was evaluated for chronic coughing, mucopurulent nasal discharge, and failure to thrive. Clinical Findings - Endoscopy was performed on the larynx, pharynx, and trachea and revealed an approximately 2-cm fluctuant subepiglottic cyst. Treatment and Outcome - The subepiglottic cyst was treated with intralesional formalin administration. Following 2 injections, 2 weeks apart, the cyst was completely resolved with no evidence of scarring or epiglottic deformity. Clinical Relevance - Findings suggest that intralesional formalin administration for treatment of subepiglottic cysts may be a minimally invasive, economically suitable alternative to surgical treatments.