[Interstitial radiotherapy].

At first the causes of the renaissance of interstitial radiotherapy are cited. The physical and radiobiological aspects about modern radionuclides are presented and compared with conventional methods. The advantages of these modern treatment schedules are demonstrated, especially in terms of radiation protection. Indications and methods of modern interstitial radiotherapy with I-125 seeds and Ir-192 wires are pointed out. Finally published results are mentioned.