In recent decades, cytopathology has assumed an increasing role in the primary diagnosis of mass lesions owing to its ability to deliver rapid, non-invasive, and timely information. This book provides a comprehensive overview of the role of cytology at various body sites. The diagnostic details covered are abbreviated in comparison with those in pathology texts. Instead, a more clinical approach is taken, with the focus on the advantages and limitations of techniques and the key features of entities that are important to clinicians. Pathological-clinical correlation is highlighted throughout the book, ensuring that it will be highly relevant for clinicians. In particular, physicians who deal with oncology patients will find it to be a rich source of guidance on how to use and understand cytopathology in the diagnosis and exclusion of malignancy.