This book is compiled from two issues of Seminars in Roentgenology on the subject of the acute abdomen. Eighteen authors have collaborated in 13 chapters that present different aspects of the radiological approach to this subject. The first chapter deals with the technical aspects of the examination, a systematic review of the ways and means available to the radiologist, and contains an excellent description of the details of technique. It is followed by a series of chapters that discuss intestinal obstruction, the special problems in pediatric cases, and inflammatory diseases. Acute extraperitoneal infection is described in an extremely informative chapter, with superb anatomical descriptions. Toxic megacolon is decribed concisely and to the point, and the roentgenological findings of diverticulitis are well analyzed and correlated with their pathological base. The radiologically difficult subject of acute pancreatitis is thoroughly reviewed and there is an excellent discussion about the diagnosis of hepatobiliary disease.