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It is a pleasure to help introduce the Third Edition of Thoracic Radiology: The Requisites. Thoracic imaging is a cornerstone of radiology practice that touches more patients than any other area of sub-specialization in radiology. Many of the same technological innovations and advancements that have propelled other areas of radiology forward in the last several years have also substantially changed the landscape in thoracic imaging, making the publication of the Third Edition timely and important. Dr. Jo-Anne O. Shepard is the editor of the new edition and has assembled a terrific team of co-editors and authors. In this regard, the Third Edition of Thoracic Radiology: The Requisites reflects an important trend in authorship. The original books were each written by a small number of people, many with only one or two authors. Over time, the breadth and complexity of each topic have increased to the point that a multi-author approach is now appropriate for the level of expertise required. Doctors Gerald F. Abbott, Jeanne B. Ackman, Subba R. Digmurthy, Mathew D. Gilman, Amita Sharma, and Carol C. Wu serve as Associate Editors for this edition. Additional contributing authors include Manudeep Kalra, Alexi Otraji, Melissa Price, Bojan Kovacina, Lan Qian (Lancia) Guo, Brett W. Carter, Mylene Truong, Christopher M. Walker, Susan Gutschow, Shaunagh McDermott, Efren J. Flores, Laura L. Avery, John W. Nance, Hristina Natcheva, Thomas Keimig, Jonathan Chung, Rydhwana Hossain, Victorine V. Muse, Milena Petranovic, Florian J. Fintelmann, Bradley S. Sabloff and Justin Stowell. It is difficult to imagine a stronger group of contributors. Dr. Shepard and her co-authors are to be congratulated on producing a high-quality book that will be both practical and manageable for the reader. The format and layout of Thoracic Radiology: The Requisites remain largely intact with early chapters on technique and normal anatomy and chapters covering major diseases and conditions. However, several new chapters address advances in technology and provide for deeper coverage of increasingly specialized clinical applications. For example, in the interval since publication of the Second Edition of Thoracic Radiology: The Requisites, the National Lung Screening Trial (NLST) demonstrated that screening for lung cancer in a defined population saves lives. This was a major milestone in medical practice that has created important opportunities for thoracic radiologists but also challenges related to adopting best practices for screening and correct application of the lung cancer staging system. Correspondingly there are two chapters in this book that address these issues, one on screening and one on staging. The digital transformation in radiology is now substantially complete. This transformation is fully incorporated into the Third Edition of Thoracic Radiology: The Requisites, including a chapter that covers PET/CT and PET/MR. While PET/CT is well established in thoracic imaging, especially for cancer diagnosis and follow-up, the potential for PET/ MR is just becoming more widely available. Many of the chapters with familiar titles are now more richly illustrated with digital images with corresponding emphasis on highresolution cross-sectional methods. The associated improvements in both image quality and diagnostic capabilities are highlighted. The Requisites books are not intended to be exhaustive. There are “mega” reference texts that catalog rare and unusual cases and that present different sides of controversies. Rather, The Requisites books are intended to provide information on the conditions that radiologists see every day, the ones that are at the core of radiology practice. In fact, one of the requests to authors is to not look up anything unusual or obscure but to put in the book what they teach their own residents every day at the workstation. Since the authors are experienced experts in their respective areas, this is predictably the most important material. The Requisites series is now well over 25 years old and has served thousands of radiologists. The books are familiar and trusted friends to many people. It is my hope and expectation that radiology trainees as well as practicing radiologists seeking to refresh their knowledge will find the Third Edition of Thoracic Radiology: The Requisites a useful text.