Diagnosis of Laryngeal Dysplasia in Seven Horses Using Magnetic Resonance Imaging and Ultrasonography

摘要

Laryngeal dysplasia caused by suspected malformation of the fourth branchial arch has been reported previously in the horse and has been associated with rostral displacement of the palatopharyngeal arch and/or right laryngeal dysfunction. These studies all described the endoscopic and/or anatomical postmortem identification of the disease, but ultrasonography or magnetic resonance imaging (MRI) of this disease have not been described. We hypothesized that MRI and ultrasound findings would accuratelyreflect the anatomic features of presumptive fourth branchial arch abnormality and therefore, allow accurate antemortem diagnosis of this condition and appropriate management.