[The difference between delayed radiation-necroses of the cerebral hemispheres and midline: its bearing in radiation therapy (author's transl)].

Delayed cerebral necroses after irradiation are to be divided into hemispheric and midline lesions, as they differ from each other in sesveral aspects. Apart from the symptoms, they are differing in the duration of latency, in the course and prognosis, and also with regard to morphology. Though there is no doubt that radiation tolerance of cerebral midline structures is relatively limited, on biological grounds, evidence of a difference between the tolerated doses could not be given from the existent inhomogeneous radiation data, with the help of the NSD-concept. Radiation planning for the region of the head, nevertheless, carefully should avoid in every case to involve the structures of the cerebral midline.