In this book are published papers presented at the first meeting about tomodensito metry (Computer Tomography) which the CEPUR organized in Luxembourg in March 1977. CEPUR (College d'enseignement post-universitaire de Radiologie) is an international medical association having as its main aim the promotion of courses in advanced radiology. Several sections deal with the subspecializations, one of which is Com puter Tomography. Thanks to the fruitful cooperation of several University Hospitals (Ancona, Leuven, Montpellier, Bruxelles, Strasbourg), the two-day meeting organized by Dr. Capesius in Luxembourg covered a certain number of aspects of clinical tomodensitometry in the brain as well as in the trunk. We hope that this volume will be the first of a series dealing with the actual problems in clinical radiology. Leuven/Bruxelles/Strasbourg A. BAERT L. JEANMART A. WACKENHEIM Contents I. Introduction to the Technology of Computer Tomography K. Ungerer. With 18 Figures ... 2 II. Head Sellar Region: Normal and Pathologic Conditions. U. Salvolini, F. Menichelli, and U. Pasquini. With 40 Figures ...... 14 Empty Sella and Pituitary Gland. J.L. Dietemann and A. Wackenheim. Wi th 3 Figures . . . . . .... . ., 38 Midline Lesions. D. Baleriaux-Waha, L.L. Mortelmans, M. Dupont, and L. Jeanmart. With 17 Figures ....... .. 39 Ventriculocisternal Pathology in Children. D. Touitou. With 9 Figures . . . . . . . . . . . . . . .. ....... 47 Endocranial Calcifications. J.H. Vandresse, G. Cornelis, and A.