Investigation of Predictive Factors for Patients with Nondiagnostic or Insufficient FNAB Results Who Underwent Thyroidectomy

Thyroid fine-needle aspiration biopsy (FNAB) is the most valuable, accurate, and inexpensive method for patients with thyroid nodules (1-3). Most biopsies are adequate for cytological diagnosis. However, 2%-18% of these biopsies are reported as nondiagnostic, and of these nondiagnostic biopsies, 1%-4% include the risk of malignancy (4). The American Thyroid Association and Bethesda System for Reporting Thyroid Cytopathology suggest performing an ultrasoundguided repeat FNAB. However, the second FNAB may also yield an inadequate result. Thus, the management of these cases is essentially determined according to the malignancy risks they include The aim of this study was to investigate the risk of malignancy in patients whose FNAB results were interpreted as nondiagnostic two times or more and who had undergone a surgical treatment.