This book, unique in focusing specifically on cardiac masses, is the result of cooperation among a number of teams of radiologists working under the aegis of the French Society of Cardiovascular Imaging (SFICV). Its goal is to review the different CMR sequences and CT acquisition protocols used to explore cardiac masses, highlighting their diagnostic capabilities. It has been designed as a teaching tool and offers a fully illustrated compendium of clinical cases, tables summarizing data, and decision-making trees essential in everyday practice. It is presented as a practical handbook and can be either read cover to cover or consulted whenever needed during a cardiac imaging assignment. The book is intended for all students and experienced practitioners, whether radiologists or not, who are interested in cardiac or thoracic pathology.