This book deals with the use of ultrasound during hepatobiliary and pancreatic surgery. This ultrasound technique represents one of the best means of perioperative exploration in this field. The work thus aims to provide surgeons with a precise description of ultrasonography including the theoretical as well as the practical bases for its application. Furthermore, three different chapters deal with ultrasonography of the liver, biliary ducts and pancreas. Each chapter begins by reviewing surgical anatomy, exploration methodology and echographic semiology, and then mentions specific problems of the organs. Hepatobiliary and pancreatic surgery is being increasingly absorbed into the framework of general and digestive surgery. Here, perioperative ultrasonography proves to be indispensible, not only for the confirmation or assessment of diagnosis, but also for establishing the best therapeutic strategy. It is a useful complement to the surgeon's eye and hand.