[The ultrastructural localization and distribution of free cholesterol (3-beta-hydroxisterol) in human cerebral tumours (author's transl)].

According to the examination of the ultrastructure of the human gliomas and the ultrastructural localization of their free cholesterol, it can be established that the main part of the free cholesterol is present in the cells in a structural fixed form and that multiplication of the free cholesterol, occurring due to cell degeneration in the vacuoles and cysts, can be brought in connection with the disintegration of these structures.