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This book aims to be a synthesis of our current knowledge about the normal and pathological esophagus. Although a number of excellent monographs on limited aspects of esophageal pathology are available, a recent handbook treating the whole of esophageal physiology and pathology is lacking. We attempted to present the collected material in such a way that even the neophyte in the field would not get lost in the wealth of data. For this reason we have included a number of illustrations such as classical radiological and endoscopic images, manometric tracings and uncomplicated graphs, which may seem superfluous for specialists but will be helpful to the reader who wants to be initiated in the subject. At the same time we tried to be fairly complete so as to make available to the esophageal specialist a book of references, to which he can readily turn when faced with rare diseases or unusual physiological or pathophysiological pheno mena. In order to achieve both aims the authors often give their own point of view when faced with controversal topics, while classical as well as more recent features and concepts are mentioned and diverging opinions discussed.