In focussing on the movement and the physiology of the pyloric region, this book uses the methods of anatomy, radiology, gastroscopy, manometry, myoelectric activity and ultrasonography of the pyloric region. The concept of a sphincteric cylinder is developed, and special emphasis is given to the pathology which affects the structure or function of the cylinder, e.g. pylorospasm, pyloric stenosis, gastric ulceration, vomiting, diabetes mellitus and carcinoma.