Medicine is an ever-changing science. Research and clinical experience are continually expanding our knowledge, in particular our understanding of proper treatment and drug therapy. The authors, editors, and publisher have made every effort to ensure that all information in this book is in accordance with the state of knowledge at the time of production of the book. Nevertheless, the authors, editors, and publisher are not responsible for errors or omissions or for any consequences from application of the information in this book and make no warranty, expressed or implied, with respect to the contents of the publication. Every reader should examine carefully the package inserts accompanying each drug and should carefully check whether the dosage schedules mentioned therein or the contraindications stated by the manufacturer differ from the statements made in this book. Such examination is particularly important with drugs that are either rarely used or have been newly released on the market. This book is a visually rich resource for pathologists who encounter the field of bone and soft tissue lesions. The traditional histologic pictures are supplemented with numerous illustrations of imaging findings, cytology, and molecular and cytogenetic information. Unlike a traditional textbook, this book provides a pictorial survey arranged in a pattern oriented approach, similar to the working method used in actual daily practice. Original artwork illustrating the molecular underpinnings of sarcomagenesis provide a valuable introduction to this complex area and are an especially useful feature. The authors of this work are both expert surgical and cytopathologists that actively practice in multidisciplinary sarcoma centers and are experienced teachers in this complex field of diagnostic pathology.