F. Schajowicz – författare

In the past 50 years considerable progress has been made in orthopedics and traumatology. One of the principal reasons for these advances has undoubtedly been the separation of these specialties from general surgery. Alongside this development the number of those devoted to the study and treatment of locomotor disabilities, who could formerly be counted on the fingers of one hand-at least in our country-has multiplied by thousands and even more have subspecialized. This accelerated growth has encouraged the sharpen­ ing of diagnostic skills, technical improvement, and the application of advances in other fields of medicine to orthopedics. However, paradoxically enough, one of the most important aspects of orthopedics, bone pathology, has not attracted enough specialists worldwide to handle the complex problems, encountered daily, that only an expert and experienced pathologist is capable of resolving. Within the modern milieu, the personality and accomplishments of Professor Fritz Schajowicz stand out distinctly. Dr. Schajowicz, of Austrian origin, studied with Pro­ fessor J. Erdheim of Vienna. Having afterwards been granted a fellowship to extend his knowledge of bone pathology at the Rizzoli Orthopedic Institute of Bologna under the direction of Professor Vittorio Putti, he complemented this work with the study of clinical orthopedics at that prestigious institution. In 1938, Professor Jose Valls visited the Rizzoli Institute and, recognizing the outstanding training of Professor Schajowicz, invited him to move to Argentina where we were in need of an expert pathologist.

During the two decades since the publication of the first edition of Histological Typing of Bone Tumours, new methods of diagnosis, es- pecially radiological imaging techniques (computed tomography and magnetic resonance imaging), associated with advances in the new cytomorphological methods including immunohistochemistry, DNA ploidy analysis, cytogenetic chromosomal investigation, etc., have greatly improved our diagnostic tools and treatment results. These advances are reflected by the publication of new editions of various important textbooks in recent years. In these publications classifica- tion criteria differed. In contrast, the WHO classification has been relatively unaltered, and has introduced a limited number of new entities and subdivided others because of distinct histological features and biological be- haviour. In general the framework and the concept of the original classifi- cation, as it has been widely accepted, remains essentially unchanged. The classification is based on the line of histological differentiation, in many instances reflecting the type of intercellular matrix material produced.This approach is justified because it avoids theoretical his- togenetic controversies.

Six years ago the editors of the Encyclopedia of Medical Radiology selected two additional editors from the emerging generation of young radiologists to complete this unique compendium of radiology. Klaus Ranniger was one of them and he worked with enthusiasm and great energy at the challenge facing him. His editorial work was excellent and he succeeded in winning internationally acclaimed scientists to contribute to this volume. Their chapters have met the requirements and goals we set out to achieve in every aspect and to the highest degree. The majority of the authors valued Klaus Ranniger not only as a fellow scientist and doctor but also as a personal friend. In America, his adopted country, he found acknowledgement of his personal achievement and scientific research. He was highly respected and admired among specialists in the field of radiology. Klaus Ranniger, our coeditor and friend, died suddenly and unexpectedly before this volume could be published. We are honored to present this volume as his legacy.FRIEDRICH HEUCK Vorwort Die Herausgeber des Handbuches der medizinischen Radiologie nahmen vor sechs Jahren aus der nachfolgenden Generation von Radiologen zwei Mitarbeiter in ihren Kreis auf, urn dieses im wissenschaftlichen Schrifttum der Welt einmalige Sammelwerk der Radiologie aus dem Springer-Verlag zum AbschluB zu bringen. Mit groBer Tatkraft und echter Begeisterung hat Klaus RANNIGER die ihm gestellten Aufgaben tibernommen.