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.