This book provides an updated comprehensive review of the FNA cytology of superficial neoplastic and non-neoplastic disease processes obtained by percutaneous ultrasound guidance. Selected video clips are intended to illustrate the most salient US findings of common entities and the methodology to appropriately harvest adequate material for diagnosis and performance of ancillary tests. The most current World Health Organization classifications of tumors of thyroid, parathyroid, and salivary glands, breast, and lymph nodes are included in the corresponding chapters, and they are followed to complement the cytomorphology and ancillary tests of the described entities. This text emphasizes the basic ultrasound characteristics of thyroid nodules, the cytology of common and uncommon neoplastic and non-neoplastic processes according to The Bethesda System for Reporting Thyroid Cytopathology and provides a technical guide for how to perform ultrasound-guided FNA of thyroid nodules to obtain adequate material for diagnosis. The volume also reviews the molecular aspects of thyroid neoplasia useful for diagnosis and targeted therapy. The Interventional Cytopathologist: Ultrasound Guided Fine-Needle Aspiration of Superficial Masses with Ultrasound Correlation 2nd Edition is a useful guide for ultrasound evaluation, cytological interpretation and differential diagnostic considerations of superficial masses. It aims to be a valuable source of information for cytopathologists, cytopathology fellows, cytotechnology students and upper level pathology residents. Endocrinologists, thyroidologists, head and neck specialists, radiologists and any professional with interest in ultrasound and fine needle aspiration cytology of superficial masses will benefit from this book. This book provides an updated comprehensive review of the FNA cytology of superficial neoplastic and non-neoplastic disease processes obtained by percutaneous ultrasound guidance. Selected video clips are intended to illustrate the most salient US findings of common entities and the methodology to appropriately harvest adequate material for diagnosis and performance of ancillary tests. The most current World Health Organization classifications of tumors of thyroid, parathyroid, and salivary glands, breast, and lymph nodes are included in the corresponding chapters, and they are followed to complement the cytomorphology and ancillary tests of the described entities. This text emphasizes the basic ultrasound characteristics of thyroid nodules, the cytology of common and uncommon neoplastic and non-neoplastic processes according to The Bethesda System for Reporting Thyroid Cytopathology and provides a technical guide for how to perform ultrasound-guided FNA of thyroid nodules to obtain adequate material for diagnosis. The volume also reviews the molecular aspects of thyroid neoplasia useful for diagnosis and targeted therapy. The Interventional Cytopathologist: Ultrasound Guided Fine-Needle Aspiration of Superficial Masses with Ultrasound Correlation 2nd Edition is a useful guide for ultrasound evaluation, cytological interpretation and differential diagnostic considerations of superficial masses. It aims to be a valuable source of information for cytopathologists, cytopathology fellows, cytotechnology students and upper level pathology residents. Endocrinologists, thyroidologists, head and neck specialists, radiologists and any professional with interest in ultrasound and fine needle aspiration cytology of superficial masses will benefit from this book. Ricardo H. Bardales, MD, FIAC, ECNU Director Interventional Cytopathology Precision Pathology Sacramento, CA USA