This book is an introduction to diagnostic radiology (including nuclear medicine). Written in a user-friendly format, it takes into account that radiology is divided into many subspecialties that constitute a universe of their own. The book is subdivided into ten sections, such as musculoskeletal, thoracic, gastrointestinal, cardiovascular and breast imaging. Each chapter is presented with an introduction of the subspecialty and ten case studies with illustrations and comments from anatomical, physiopathological and radiological standpoints and with bibliographic recommendations. This book is aimed at radiologists, radiology residents, medical students, nurses, technicians, and anybody else beginning to work in the radiological world.