title: Evidence for thyroid development from the fourth branchial pouch.
abstract: Fourth branchial pouch anomalies are rarely reported. A case is described of an isolated branchial cyst which was found to contain ectopic thyroid tissue. This case, together with four others previously reported, support the theory that the thyroid gland may receive contributions from the fourth branchial pouch during development.
authors.affiliation: Department of Otolaryngology, West Middlesex University Hospital, Isleworth, London.
authors.forename: A K
authors.initials: AK
authors.lastname: Ohri
authors.forename: S K
authors.initials: SK
authors.lastname: Ohri
authors.forename: M P
authors.initials: MP
authors.lastname: Singh
mesh_terms: D001935:Branchioma / Q000000981:diagnostic imaging / Q000473:pathology*; D002648:Child; D002828:Choristoma / Q000473:pathology*; D006258:Head and Neck Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D006801:Humans; D008297:Male; D013961:Thyroid Gland / Q000000981:diagnostic imaging / Q000196:embryology; D014463:Ultrasonography