The first radiological examination of an infant was reported as early as 1896. This was the prelude to a tremendous amount of pioneer work which was accomplished in the following decades. Interaction of increasing experience, technical improvement and new therapeutic achievement led to the present status of pediatric radiology. In almost any investigation and evaluation of childhood disease, pediatric radiology has a cardinal role. The establishment of the European Society of Pediatric Radiology in 1963, and the start of the journal Pediatric Radiology 10 years later, have created international platforms for the circulation of rapidly accumulating knowledge. Both ventures have helped to underpin high educational standards in the specialty. In many countries national post-graduate courses have contributed quite admirably to favourable trends. More than ever, today medicine is an international science: medical training on an international level has therefore come to stay. This results in a more rapid dissemination of "Current Concepts in Pediatric Radiology" among all those devoted to this fascinating branch of radiology. This book, mainly based on the lectures given at the First International Post-Graduate Course sponsoned by the Swedish Society of Pediatric Radiology in May 1976, presents the contribu­ tions of the distinguished guest speakers on selected topics.