title: [Parathyroid carcinoma].
abstract: BACKGROUND
  Parathyroid carcinoma is the least frequent malignancy among endocrine tumors. In the most reported series of patients with primary hyperparathyroidism the incidence of carcinoma is less than 1%. Racognition by a surgeon that the parathyroid tumor is malignant, and the performance of an adequate en bloc removal of primary lesion, with histologic diagnosis offer the best treatment of a patient with this unusual malignancy.
  
  
  METHODS
  We reported a 30-year-old patient with parathyroid carcinoma, primary hyperparathyroidism, and recurrent nephrocalcinosis. Marked hypercalcemia, low serum phosphorus, and substantial elevation of serum parathyroid hormone indicated a diagnosis of primary hiperparathyroidism. General symptoms were anorexia, muscle weakness, back pain and depression. Ultrasonography done before the surgery revealed a 2 cm upper left parathyroid gland with solid and cystic areas. The neck exploration was done with en block resection of the tumor. A histopathological evaluation confirmed the diagnosis of parathyroid carcinoma. Over more than a three-year-follow-up, the patient had no evidence of the disease recurrence and his serum PTH and calcium levels remained within the normal.
  
  
  CONCLUSIONS
  Parathyroid carcinoma is a rare cause of primary hyperparathyroidism. Preoperative diagnosis remains a challenge. Radical en bloc resection of the tumor is the treatment of choice for this malignancy.
authors.affiliation: Klinicki centar Crne Gore, Hirurska klinika, Podgorica, Crna Gora. a.filipovic@cg.yu
authors.forename: Aleksandar
authors.initials: A
authors.lastname: Filipović
authors.forename: Ivan
authors.initials: I
authors.lastname: Paunović
authors.forename: Dragutin
authors.initials: D
authors.lastname: Savjak
authors.forename: Tamara
authors.initials: T
authors.lastname: Zivković
mesh_terms: D000328:Adult; D002277:Carcinoma / Q000150:complications / Q000175:diagnosis / Q000601:surgery; D006801:Humans; D049950:Hyperparathyroidism, Primary / Q000150:complications; D008297:Male; D010282:Parathyroid Neoplasms / Q000150:complications / Q000175:diagnosis / Q000601:surgery