A number of vital therapeutic modalities are not covered adequately in current dermatology textbooks. This book is intended to fill that gap. It originated in a series of special lectures on modem applications of physical modalities given at recent annual meetings of the American Academy of Dermatology; the main topics were radiotherapy, electrosurgery, phototherapy, cryosurgery, and related therapeutic modalities. The authors, recognized authorities in their field, have included much addi tional information which could not be covered in the original lectures because of time limitations. The indications for modem dermatological x-ray therapy reflect the basic views of the recently published guide lines of the National Academy of Sciences-National Research Council. Both text and illustrations are oriented toward the practical aspects of therapy with physical modalities. A special effort was made to bring the contributions up to date; pertinent references have been added for those who wish to pursue particular topics still further. Where there is an apparent overlap between chapters, it was felt to be advantageous because different authors approached their subject from different perspectives. I am most grateful to the various authors who generously contributed despite their many other commitments. I wish, also, to thank the staff of Springer-Verlag for their advice and assistance in the preparation of the manuscript."

TO THE ENGLISH EDITION Ionizing radiation has played an important role in the treatment of skin diseases for many decades. With strict adherence to modern standards of radiation protection, radiotherapy is a safe and effective method that benefits many patients who cannot be treated adequately by other means. Although indications for dermatologic radiotherapy have decreased significantly due to advances in other therapeutic modalities, many dermatologists feel strongly that ionizing radiation is an integral part of dermatologic therapy that should not be relinquished to other specialties because of the highly specialized anatomic, pathologic, and technologic knowledge required. A recent survey of the National Program for Dermatology showed that 44% of 2,444 responding dermatologists use radiotherapy regularly for various skin conditions, particularly in the treatment of cutaneous carcinomas. Significantly, the American Board of Dermatology has decided to continue its requirement of special knowledge in dermatologic radiation therapy for board certification. Because I have taught this dermatologic subspecialty at various levels, both in Europe and in the United States, I readily agreed to accept Pro fessor Braun-Falco's invitation to cooperate with him and Dr. Lukacs in the preparation of the English edition of this new guide. The text deals mostly with modern concepts of dermatologic radiotherapy and empha sizes practical aspects of treatment. Although it is written as an introduc tion for young dermatologists, it may also be useful to experienced clinicians who want to keep up with recent developments in this field."