[Afterloading contact therapy in childhood tumors].

Two examples are presented to apply high dose rate afterloading therapy in treatment of tumors in childhood. The AL-therapy can be indicated in tumors in natural or artificial openings of the body that are limited locoregionally or were operated in sano. Applying brachytherapy radiogenic late-effects can be prevented in normal tissue like gonads and skeleton predominantly. On the other hand a tumor dimension greater than the target volume attainable by contact therapy has to be excluded certainly to avoid local recurrences.