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...