Introduction and Clinical Aspects
The second edition of this book incorporates the recent terminology and reporting guidelines for thyroid fine needle aspirations (FNAs), the Bethesda System for Reporting Thyroid Cytopathology (BSRTC) that emerged from a multidisciplinary National Cancer Institute (NCI) Thyroid FNA State of the Science conference (2007). A major challenge in the application of FNA to the diagnosis of thyroid lesions has been the inconsistent use of terminology for reporting results of thyroid FNAs both within laboratories and between different institutions. Not only has this hindered the sharing of information between different institutions, but it has created difficulties for clinicians managing patients with thyroid disease. Throughout this second edition, we will use a simple algorithmic approach, which we have modified to incorporate the BSRTC, to explain how to evaluate thyroid FNAs.