title: Simultaneous squamous cell carcinoma and papillary adenocarcinoma of the thyroid gland.
abstract: A case of simultaneous squamous cell carcinoma and papillary adenocarcinoma in the thyroid gland is reported. A pure squamous cell carcinoma arose in the right lobe, and a pure papillary adenocarcinoma without squamous metaplasia arose in the left lobe. Both cancers came into collison at the isthmus. The case is unique in that the tumor was a so-called collison tumor but not a mixed tumor.
mesh_terms: D000231:Adenocarcinoma, Papillary / Q000473:pathology*; D000368:Aged; D001344:Autopsy; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D005260:Female; D006801:Humans; D009378:Neoplasms, Multiple Primary; D013964:Thyroid Neoplasms / Q000473:pathology*