title: Preoperative localisation of parathyroid glands in primary hyperparathyroidism.
abstract: OBJECTIVE
  To assess the accuracy of preoperative localisation of abnormal parathyroid glands in patients with primary hyperparathyroidism by comparing results of echography and 201thallium and (99m)technetium subtraction scans with the operative findings.
  
  
  METHODS
  Retrospective study.
  
  
  METHODS
  Teaching hospital, Taiwan.
  
  
  METHODS
  84 Patients with primary hyperparathyroidism, 83 of whom had bilateral exploration of the neck and thymus and one mediastinotomy. Seventy-three patients (69 with adenomas and 4 with hyperplasia) had high-resolution echography and 56 (52 with adenomas and 4 with hyperplasia) had 210Tl/99mTc subtraction scans.
  
  
  METHODS
  Results of follow-up.
  
  
  RESULTS
  78 Patients had parathyroid adenomas and 6 had hyperplasia. Parathyroid echography had a sensitivity (> or = 0.5 cm) of 55%, a specificity (< 0.5 cm) of 100%, a positive predictive value of 90%, and an accuracy of 77%. 210Tl/99mTc subtraction scanning had a sensitivity (> or = 0.5 cm) of 70%, a specificity (< 0.5 cm) of 100%, a positive predictive value of 100%, and an accuracy of 86%. The double tracer scan was slightly but not significantly more accurate than echography (p = 0.09). There were few postoperative complications except for transient hypocalcaemia, which usually lasted less than two weeks. All but one of the operations was successful. That one developed permanent hypocalcaemia, but it might have been caused by previous thyroid surgery and parathyroid injury.
  
  
  CONCLUSIONS
  To increase the success rate of parathyroid surgery, we recommend preoperative localisation with 210Tl/99mTc subtraction scan instead of echography, and routine bilateral exploration of the neck and thymus.
authors.affiliation: Surgical Department, Chang Gung Memorial Hospital at Kaohsiung, Chang Gung Medical School, Kaohsiung Hsient, Taiwan, ROC.
authors.forename: F F
authors.initials: FF
authors.lastname: Chou
authors.forename: P W
authors.initials: PW
authors.lastname: Wang
authors.forename: S M
authors.initials: SM
authors.lastname: Sheen-Chen
mesh_terms: D000236:Adenoma / Q000150:complications / Q000000981:diagnostic imaging* / Q000601:surgery; D000328:Adult; D005260:Female; D006801:Humans; D006961:Hyperparathyroidism / Q000209:etiology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D010280:Parathyroid Glands / Q000000981:diagnostic imaging*; D010282:Parathyroid Neoplasms / Q000150:complications / Q000000981:diagnostic imaging* / Q000601:surgery; D016105:Parathyroidectomy; D011237:Predictive Value of Tests; D011300:Preoperative Care; D011877:Radionuclide Imaging; D012680:Sensitivity and Specificity; D013382:Subtraction Technique; D013667:Technetium; D013794:Thallium Radioisotopes; D014463:Ultrasonography
chemical_list: D013794:Thallium Radioisotopes; D013667:Technetium