Journal List > Korean J Endocr Surg > v.15(1) > 1060137

Lee and Soh: Current Guidelines for Fine Needle Aspiration of Thyroid Nodules

Abstract

Thyroid cancer is a hot issue in Korea because there is debate on screening and diagnosis of thyroid cancer. Therefore, we reviewed the guidelines for the management of thyroid nodules of other countries. Western countries accepted the criteria of fine needle aspiration including the tumor size of thyroid nodules, although ultrasonographic morphologic characteristics are more important to diagnose the thyroid cancer than tumor size. This recommendation is based on good prognosis of papillary thyroid microcarcinoma. However, small subset of papillary thyroid microcarcinoma has aggressive behavior, which we cannot discern from those with benign behavior before operation. Therefore, further researches are necessary to resolve these problems and improve the management of papillary thyroid cancer avoiding overtreatment and mismanagement.

References

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Table 1.
NCCN guidelines, version 2. thyroid carcinom (2014)
Ultrasonographic features Threshold for FNA
Solid nodule  
 With suspicious US features ≥1.0 cm
 Without suspicious US features ≥1.5 cm
Mixed cystic-solid nodule  
 With suspicious US features ≥1.5∼2.0 cm
 Without suspicious US features ≥2.0 cm
Spongiform nodule ≥2.0 cm
Simple cyst Not indicated
Suspicious cervical lymph node FNA node±FNA thyroid nodule
Table 2.
FNA recommendation by American Thyroid Association (2009)
Ultrasonographic features T Threshold for FNA
High-risk history  
 Nodule with suspicious US features >0.5 cm
 Nodule without suspicious US features >0.5 cm
Abnormal cervical lymph nodes All
Microcalicifications present in nodule ≥1 cm
Solid nodule  
 With hypoechic ≥1.0 cm
 Without iso- or hyperechoic ≥1∼1.5 cm
Mixed cystic-solid nodule  
 With suspicious US features ≥1.5∼2.0 cm
 Without suspicious US features ≥2.0 cm
Spongiform nodule ≥2.0 cm
Simple cyst Not indicated
Table 3.
The management of thyroid cancer, British Thyroid Association (2014)
BTA
Consider biopsy
 Grade US features
U5 malignancy 1. Solid, hypo-, lobulated/irregualr, microcalicification (PTC) YES
  2. Solid, hypo-, lobulated/irregular, globular calcification (MTC)  
  3. Intra-nodular vascularity  
  4. Taller than wide  
  5. lymphadenopathy  
U4 Suspicious 1. Solid, hypo-echoid YES
  2. Solid, very hypo-  
  3. Disrupted peripheral calcification, hypoechoic  
  4. Lobulated margin  
U3 Indeterminate/equivocal 1. Homogenous, iso-/hyper, solid, halo (follicular lesion) YES
  2. Hypo-, equivocal echogenic foci, cystic change  
  3. Mixed central vascularity  
U2 Benign 1. Halo, hyper-/iso- No
  2. Cystic chagne+/− ring down sign (colloid) (yes, if high risk history)
  3. Micro-cystic/spongioform  
  4. Peripheral egg shell calcification  
  5. Peripheral vascularity  
U1 Normal   No
Table 4.
American Association of Clinical Endocrinologists (AACE), Associazione Medici Endocrinologi (AME), and European Thyroid Association (ETA) (2010)
  FNA guideline
Nodule(s) >1 cm Solid and hypoechoic
Any size Extracapsular growth or metastatic cervical lymph nodes
Any size History of neck irradiation in childhood or adolescence
  PTC, MTC, or MEN 2 in first-degree relatives
  Increased calcitonin levels in the absence of interfering factors
<1 cm Coexistence of 2 or more suspicious US findings
No Hot nodules in scintigraphy
MNG Selected on the basis of previously described criteria
Not biopsy hot areas
Biopsy both LN and nodule in presence of suspicious cervical LN
Solid-cystic Sample the solid compoenent of the lesion by UGFNA biopsy
Submit both FNA biopsy specimen and drained fluid for cytologic examination
Incidentaloma Should be managed according to previously described criteria
US evaluation before consideration for UGFNA biopsy
Hot nodule on PET should be undergo US evaluation plus UGFNA biopsy

UGFNA = Ultrasound-guided fine needle aspiration; MNG = multinodular goiter; PTC = papillary thyroid cancer; MTC = medullary thyroid cancer; MEN 2 = multiple endocrine neoplasia type 2.

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