The diagnostic services—pathology and radiology—are the cornerstone for supporting the delivery of high-quality healthcare by providing timely and accurate diagnosis. In this era of precision medicine, it has become increasingly important for these two services to work collaboratively in supporting patients and clinical colleagues by informing and communicating the selection and interpretation of appropriate diagnostic tests, as well as obtaining adequate tissue for diagnosis, prognostication, and therapy at initial presentation and, if required, during disease progression/relapse. This book is aimed at practicing cytopathologists and interventional radiologists as well as trainees in these areas. An essential requirement in the accurate diagnosis of these mass lesion biopsies is the correlation of cytomorphology with the radiological findings and adequate triage of acquired material during the biopsy procedure. The cytologic findings, gross surgically resected specimens, and imaging findings are illustrated to provide a complete pathologic-radiologic correlation of the entities discussed. This Atlas of Cytopathology and Radiology serves as a useful guide for pathologists and radiologists in the appropriate triage and diagnosis of deep seated mass lesions biopsied under ultrasound, CT Scan or fluoroscopic guidance.