title: Thymopharyngeal duct cyst: MR imaging of a third branchial arch anomaly in a neonate.
abstract: Third branchial arch anomalies are rare. The authors present a case report of a neonate with a rapidly growing neck mass due to cystic dilation of a persistent thymopharyngeal duct, which is a derivative of the third branchial arch. The presence of thyroid and thymic tissue in the cyst wall, the communication of the cyst with the piriform sinus, and the relationship of the cyst to carotid vessels and the sternomastoid muscle were consistent with the features of a thymopharyngeal duct cyst embedded in the thyroid gland.
authors.affiliation: Department of Radiology, Loyola University Medical Center, Maywood, IL 60153.
authors.forename: A
authors.initials: A
authors.lastname: Vade
authors.forename: A
authors.initials: A
authors.lastname: Griffiths
authors.forename: A
authors.initials: A
authors.lastname: Hotaling
authors.forename: J F
authors.initials: JF
authors.lastname: Eisenbeis
authors.forename: A N
authors.initials: AN
authors.lastname: Husain
mesh_terms: D001934:Branchial Region / Q000002:abnormalities*; D001935:Branchioma / Q000175:diagnosis*; D003560:Cysts / Q000175:diagnosis*; D005260:Female; D006258:Head and Neck Neoplasms / Q000175:diagnosis*; D006801:Humans; D007231:Infant, Newborn; D008279:Magnetic Resonance Imaging / Q000379:methods; D008476:Mediastinal Cyst / Q000175:diagnosis*; D010608:Pharyngeal Diseases / Q000175:diagnosis*