This book is the 5th in an exceptional series which, in a most uncommon way, constitutes an original encyclopaedia of esophagology. It is devoted to a single subject: the esophagogastric junction. These few centimetres are dissected into 420 questions which call on all the disciplines involved by its physiology, its diverse diseases and their various treatments. 450 answers, provided by the most renowned experts, each one shedding light on one small, but essential, fragment of the subject. The book offers: A succesion of syntheses; A profusion of targeted bibliographical references; An access, now made easy, to highly elaborated knowledge; A precious volume for researchers, specialists, departments heads, general practitioners and students.