title: Thyroid Fine-needle aspiration biopsy: an evaluation of its utility in a community setting.
abstract: BACKGROUND
  Thyroid cancer rates are on the rise worldwide with over 5000 new cases estimated in Canada in 2012. The American Thyroid Association recommends the use of fine-needle aspiration biopsy (FNA) in the workup of thyroid nodules. Studies show that thyroid FNA accuracy may vary based on interpretation by cytopathologists in academic versus community centres. To date, there has been no literature published addressing the accuracy or utility of preoperative FNA in a Canadian community center. Our goals were to demonstrate the accuracy of thyroid FNA at our centre, and to compare our results to those published in the literature.
  
  
  METHODS
  Medical records for patients who underwent thyroidectomy performed by two otolaryngologists in Fredericton, NB, between September 2008 and February 2013 were reviewed. 125 patients with 197 FNAs were analyzed. Fisher's Exact test was used to compare the malignancy rates in each FNA category, and Chi-Square test was used for FNA distribution comparison.
  
  
  RESULTS
  The distribution of all FNA diagnoses at our centre was as follows: 38 (19%) benign, 100 (51%) inconclusive, 8 (4%) suspicious for malignancy, 2 (1%) malignant, and 49 (25%) unsatisfactory. FNA distribution was significantly different between our centre and comparison centres (Chi-Square p < 0.05). Our malignancy rates within each category using each FNA sample as a data point were 26.3%, 29.0%, 75%, 100% and 12.2% respectively. Comparison to other community studies revealed that we have significantly higher malignancy rates with benign FNAs (Fisher's exact p = <0.05). Analysis using our most malignant FNA data yielded similar results.
  
  
  CONCLUSIONS
  Thyroid FNA accuracy varies between institutions, and this may affect its utility in the workup of a thyroid nodule at some centres. Expert cytopathology opinions may be an asset in interpreting FNA samples in small community centres where volumes are relatively low, however our data do not support this assertion. It is essential that physicians continue to use clinical judgment first and foremost when evaluating thyroid nodules.
authors.affiliation: Memorial University Faculty of Medicine, S-1758B 300 Prince Phillip Drive, St John's, NL, A1B 3 V6, Canada. k55arl@mun.ca.
authors.forename: Andre R
authors.initials: AR
authors.lastname: Le
authors.affiliation: Department of Otolaryngology - Head & Neck Surgery, Zone 3, Horizon Health Network, 700 Priestman St, Fredericton, NB, E3B 5 N5, Canada. info@rivervalleyent.ca.
authors.forename: Gregory W
authors.initials: GW
authors.lastname: Thompson
authors.affiliation: Department of Otolaryngology - Head & Neck Surgery, Zone 3, Horizon Health Network, 700 Priestman St, Fredericton, NB, E3B 5 N5, Canada. hoyt@rivervalleyent.ca.
authors.forename: Benjamin John A
authors.initials: BJ
authors.lastname: Hoyt
mesh_terms: D000328:Adult; D000368:Aged; D044963:Biopsy, Fine-Needle / Q000706:statistics & numerical data*; D003151:Community Health Centers / Q000706:statistics & numerical data*; D003431:Cross-Cultural Comparison; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009523:Newfoundland and Labrador; D015588:Observer Variation; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012189:Retrospective Studies; D013961:Thyroid Gland / Q000473:pathology*; D013964:Thyroid Neoplasms / Q000453:epidemiology / Q000473:pathology* / Q000601:surgery; D013965:Thyroidectomy; D014600:Utilization Review / Q000706:statistics & numerical data