title: Anaplastic carcinoma of the thyroid with chondroblastoma features mimicking papillary carcinoma: a case report.
abstract: BACKGROUND
  An unusual case of anaplastic carcinoma of the thyroid arising from a metastatic focus of papillary carcinoma.
  
  
  METHODS
  The tumor affected a 69-year-old woman with a history of total thyroidectomy for papillary thyroid carcinoma 4 years previously. She presented with a rapidly enlarging neck mass that histologically simulated chondroblastoma. A small, embedded focus of residual follicular variant of papillary carcinoma was present. The patient died of disease 3 months later.
  
  
  CONCLUSIONS
  This "chondroblastoma" variant of anaplastic thyroid carcinoma has not been reported to date.
authors.affiliation: Department of Pathology, University of New Mexico, Albuquerque, New Mexico 87131, USA. lcerilli@salud.unm.edu
authors.forename: Lisa A
authors.initials: LA
authors.lastname: Cerilli
authors.forename: William J
authors.initials: WJ
authors.lastname: Frable
authors.forename: Michael F
authors.initials: MF
authors.lastname: Spafford
mesh_terms: D000368:Aged; D002114:Calcinosis; D002277:Carcinoma / Q000473:pathology*; D002291:Carcinoma, Papillary / Q000473:pathology*; D002804:Chondroblastoma / Q000473:pathology*; D017809:Fatal Outcome; D005260:Female; D015726:Giant Cells / Q000473:pathology; D006801:Humans; D007633:Keratins / Q000378:metabolism; D013964:Thyroid Neoplasms / Q000473:pathology*
chemical_list: D007633:Keratins