Role of core needle biopsy and ultrasonographic finding in management of indeterminate thyroid nodules

Abstract

BACKGROUND: Thyroid fine-needle aspiration (FNA) is used as a screening test of choice for evaluation of thyroid nodules. However, approximately 15% to 25% of the cases are classified as indeterminate, posing dilemmas in decision-making. This study was designed to compare the diagnostic performances of second FNA and core needle biopsy of indeterminate nodules by initial FNA. METHODS: From February 2005 through June 2009, 258 patients who completed scheduled follow-ups were enrolled and the follow-up results were analyzed. RESULTS: Nondiagnostic results were obtained in 41.8% of the second FNA group and in 1.7% of the core needle biopsy group (p < .001; chi-square). The nodules that show borderline features in preoperative ultrasonography had a malignancy rate of 18.3% and could be identified successfully with core needle biopsy. CONCLUSION: Core needle biopsy is a better method for evaluating indeterminate nodules by initial FNA than second FNA, especially in patients with ultrasonographic findings of a borderline nodule.