[The nosological position and histogenic origin of the so-called cerebellar astrocytomas (author's transl)].

The unusual status of the cerebellar astrocytoma is based upon clinical and histological evidence. "Bergstrand Tumour" is proposed as a new name for it. A new concept of its origin is put forward, namely that it is derived from the "tanycytes" (Horstmann) of the periventricular structures.