title: Thyroid teratoma in an 11-month-old infant.
abstract: We report a case of congenital benign thyroid teratoma in an 11-month-old male infant who was found to have right thyroid gland mass since birth. The tumor was 25 x 20 x 15 mm with whole thin capsule and could be easily dissected from the surrounding normal thyroid tissue at surgery. Histologically, tumor had mature derivatives of the three primordial germ layers with a variety of benign and well-differentiated elements. It was the most conspicuous feature that the tumor was composed mainly of the neurological tissue resembling brain tissue with glial cells and ependymal epithelium components. There were a few anastomosing variably sized tubules and cysts lined by ependymal epithelial cells with papillary feature and retinal pigment epithelial cells. In summary, benign teratoma of thyroid gland in an 11-month-old infant was morphologically and immunophenotypically identified.
authors.affiliation: Department of Pathology, Second Xiang Ya Hospital of Central South University, 156 Ren-Min Road, Changsha, Hunan 410011, China.
authors.forename: Song-Qing
authors.initials: SQ
authors.lastname: Fan
authors.forename: Qing-Chun
authors.initials: QC
authors.lastname: Liang
authors.forename: Yi
authors.initials: Y
authors.lastname: Jiang
mesh_terms: D006801:Humans; D007223:Infant; D008297:Male; D013724:Teratoma / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D013964:Thyroid Neoplasms / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery