title: Parathyroid carcinoma presenting as tertiary hyperparathyroidism.
abstract: A case of malignant transformation in established secondary hyperparathyroidism presenting as tertiary hyperparathyroidism is reported. Although rare, this occurrence has important medical and surgical implications.
mesh_terms: D000328:Adult; D002118:Calcium / Q000097:blood; D002471:Cell Transformation, Neoplastic / Q000097:blood / Q000473:pathology*; D005260:Female; D006801:Humans; D006961:Hyperparathyroidism / Q000097:blood / Q000473:pathology*; D006965:Hyperplasia / Q000473:pathology; D010280:Parathyroid Glands / Q000473:pathology; D010282:Parathyroid Neoplasms / Q000097:blood / Q000473:pathology*
chemical_list: D002118:Calcium