title: Caudal mediastinal thyroglossal duct cyst in a cat.
abstract: An eight-year-old domestic shorthair cat was evaluated because of dyspnoea secondary to pleural effusion. Ultrasound examination identified a large anechoic cyst-like structure in the caudal thorax. A median sternotomy was performed, and the cystic mass was removed. Microscopically, the excised tissue was identified as a multilocular thyroglossal duct cyst with ectopic thyroid tissue. To the authors' knowledge, this is the first report of a mediastinal thyroglossal duct cyst in a cat. Despite the rarity of this lesion, it should be considered when a cystic thoracic structure is identified on thoracic ultrasound. Surgical excision of the cyst resulted in complete resolution of the pleural effusion and clinical signs.
authors.affiliation: Michigan Veterinary Specialists, 29080 Inkster Road, Southfield, MI 48336, USA.
authors.forename: A
authors.initials: A
authors.lastname: Lynn
authors.forename: J M
authors.initials: JM
authors.lastname: Dockins
authors.forename: N F
authors.initials: NF
authors.lastname: Kuehn
authors.forename: K K
authors.initials: KK
authors.lastname: Kerstetter
authors.forename: D
authors.initials: D
authors.lastname: Gardiner
mesh_terms: D000818:Animals; D002371:Cat Diseases / Q000097:blood / Q000000981:diagnostic imaging* / Q000601:surgery; D002415:Cats; D008297:Male; D008476:Mediastinal Cyst / Q000000981:diagnostic imaging / Q000601:surgery / Q000662:veterinary*; D010996:Pleural Effusion / Q000209:etiology / Q000662:veterinary; D013955:Thyroglossal Cyst / Q000000981:diagnostic imaging / Q000601:surgery / Q000662:veterinary*; D016896:Treatment Outcome; D014463:Ultrasonography