role of radiological examination and endos­ have, he is in an excellent position to re-evaluate copy. Chapter 6 deals with a quantative study of and improve his own technique of examination. standard biphasic-contrast examinations in patients The author believes that the radiological exam­ over a period of 3 years. This study was restricted to ination retains its value as a screening technique and malignant lesions, because it is only in this group a complementary method to gastroscopy and biop­ that the definite criterion, a histological diagnosis, is sy. Only a sophisticated radiological technique will obtained. The natural history of malignant lesions fulfil these requirements. In 1973 the author devel­ also makes follow-up studies possible. Results of the oped a standard examination that was called "bi­ diagnosis of Early Gastric Cancer (EGC) are phasic", because it combines the advantages of included.