Abstract
Introduction: The 2007 National Cancer Institute (NCI) Thyroid Fine Needle Aspiration (FNA) State of the Science Conference proposed a 6 tiered classification scheme for thyroid FNA. The indeterminant category was partially replaced by a new category “Atypia of Undetermined Significance” (AUS). The malignancy rate for AUS FNAs should be between 5 and 10%. In the absence of risk factors or radiographic features of thyroid cancer, repeat FNA in 3-6 months is recommended. We found that from 2000-2009, 28% of thyroid nodule FNAs at our institution initially read as AUS had no repeat FNA and no surgical resection, 43% went directly to surgery, and 29% had repeat FNA.
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