[Ultrastructure of intra-ovarian granulosa cell tumour (author's transl)].

The granulosa cell tumour is of epitheloid structure. Two characteristic cell types can be distinguished. One of them appears "brighter" in electron-optical investigation and may have originated from theca formations. These is a highly developed variety of organelles, including endoplasmatic reticulum, mitochondria, and ribosomes, which is just a strong in synthesis as steroidogenic cells. The existence of an intercellular drainage system may be presumed, in similarity to corpus luteum, to carry steroids from cell to blood capillary. Amitotic cell division has been noticed as a peculiarity of reduplication of tumour parenchyma.