title: Hyperparathyroidism after radioactive iodine therapy.
abstract: BACKGROUND
  Radioactive iodine (RAI) treatment has been suggested to cause primary hyperparathyroidism (HPT). We describe a series of patients with HPT and a history of RAI exposure.
  
  
  METHODS
  Patient demographic and clinical information was evaluated, including the latency time to the development of HPT after RAI exposure.
  
  
  RESULTS
  We treated 11 patients with HPT and a history of RAI exposure. RAI treatment was administered for benign thyroid disease in 9 (82%) cases. Thirty-six cases of HPT after RAI exposure in the English literature were compiled for further analysis. In this collective experience, the average latency time to the development of HPT after RAI treatment was 13.5 +/- 9.1 years and was found to be inversely correlated with age at RAI exposure.
  
  
  CONCLUSIONS
  Patients who undergo RAI treatment are at risk of developing HPT, and this risk appears to increase in elderly patients. Serum calcium surveillance is recommended for patients who have undergone RAI treatment.
authors: Department of Surgery, University of California San Francisco and UCSF/Mt Zion Medical Center, 1600 Divisadero Street, #C347, San Francisco, CA 94143-1674, USA.
authors: Shanthi M
authors: SM
authors: Colaço
authors: Ming
authors: M
authors: Si
authors: Emily
authors: E
authors: Reiff
authors: Orlo H
authors: OH
authors: Clark
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D005260:Female; D006801:Humans; D006961:Hyperparathyroidism / Q000209:etiology*; D007457:Iodine Radioisotopes / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D011878:Radiotherapy / Q000009:adverse effects*; D012189:Retrospective Studies
chemical_list: D007457:Iodine Radioisotopes