Subepiglottic cyst causing upper airway obstruction in a neonatal calf.

A 14-day-old female Brahman calf was referred because of respiratory stridor since birth. Radiography and endoscopy were used to diagnose a pharyngeal cyst, which was subsequently surgically removed. The subepiglottic location and histopathologic features of the cyst were consistent with origin from an embryologic thyroglossal duct remnant.