title: Sonographically guided fine-needle biopsy of thyroid nodules: the effects of nodule characteristics, sampling technique, and needle size on the adequacy of cytological material.
abstract: OBJECTIVE
  To evaluate the effects of sonographic characteristics of thyroid nodules, the diameter of needle used for sampling, and sampling technique on obtaining sufficient cytological material (SCM).
  
  
  METHODS
  We performed sonography-guided fine-needle biopsy (FNB) in 232 solid thyroid nodules. Size-, echogenicity, vascularity, and localization of all nodules were evaluated by Doppler sonography before the biopsy. Needles of size 20, 22, and 24 G were used for biopsy. The biopsy specimen was acquired using two different methods after localisation. In first method, the needle tip was advanced into the nodule in various positions using a to-and-fro motion whilst in the nodule, along with concurrent aspiration. In the second method, the needle was advanced vigorously using a to-and-fro motion within the nodule whilst being rotated on its axis (capillary-action technique).
  
  
  RESULTS
  The mean nodule size was 2.1+/-1.3 cm (range 0.4-7.2 cm). SCM was acquired from 154 (66.4%) nodules by sonography-guided FNB. In 78 (33.6%) nodules, SCM could not be collected. There was no significant difference between nodules with different echogenicity and vascularity for SCM. Regarding the needle size, the lowest rate of SCM was obtained using 20 G needles (56.6%) and the highest rate of adequate material was obtained using 24 G needles (82.5%; p=0.001). The SCM rate was 76.9% with the capillary-action technique versus 49.4% with the aspiration technique (p<0.001).
  
  
  CONCLUSIONS
  Selecting finer needles (24-25 G) for sonography-guided FNB of thyroid nodules and using the capillary-action technique decreased the rate of inadequate material in cytological examination.
authors.affiliation: Department of Radiology, Faculty of Medicine, University of Kocatepe, Afyonkarahisar Turkey. bumin.degirmenci@gmail.com
authors.forename: B
authors.initials: B
authors.lastname: Degirmenci
authors.forename: A
authors.initials: A
authors.lastname: Haktanir
authors.forename: R
authors.initials: R
authors.lastname: Albayrak
authors.forename: M
authors.initials: M
authors.lastname: Acar
authors.forename: D A
authors.initials: DA
authors.lastname: Sahin
authors.forename: O
authors.initials: O
authors.lastname: Sahin
authors.forename: A
authors.initials: A
authors.lastname: Yucel
authors.forename: G
authors.initials: G
authors.lastname: Caliskan
mesh_terms: D000328:Adult; D000368:Aged; D044963:Biopsy, Fine-Needle / Q000379:methods; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013961:Thyroid Gland / Q000000981:diagnostic imaging / Q000473:pathology*; D016606:Thyroid Nodule / Q000000981:diagnostic imaging / Q000473:pathology*; D018615:Ultrasonography, Doppler, Color / Q000379:methods; D018084:Ultrasonography, Interventional / Q000379:methods