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An electron microscopic study of meningiomas

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Summary

Seventeen surgically removed meningiomas of the endotheliomatous and five of the fibromatous type were investigated with an electron microscope. Differences of the development of cytoplasmic processes and the relations between plasma membranes of blastomatous cells were observed in endotheliomatous meningiomas. In four of the fibromatous tumors the cell groups were surrounded by spaces of connective tissue. Although most of the tumor cells were light cells and are not essentially different from the tumor cells of the endotheliomatous meningiomas, the histological structure of fibromatous meningiomas is clearly distinguished from the endotheliomatous type, because of the greater amount of connective tissue. The dark cells may be divided into two types: the first was found in those four tumors, where the connective tissue is well developed, while the second one only occurred in one of the tumors. The analysis of the inner cell structure as well as the presence of interstages between dark and light cells makes it probable that dark and light cells are different types of one original cell. The cause of this different appearance of the menigioma cells is discussed. The fine structure of the tumor cells showed a great similarity with that of normal arachnoidal cells. Conclusions on the blastodermic origin of normal and blastomatous meningial cells on the basis of ultrastructural characteristics, however, seem to be premature.

Zusammenfassung

17 chirurgisch entfernte Meningiome vom endotheliomatösen und 5 vom fibromatösen Typ wurden elektronenmikroskopisch untersucht. Unterschiede im Entwicklungsgrad der cytoplasmatischen Fortsätze und der Beziehungen zwischen den Plasmamembranen der Tumorzellen wurden in den endotheliomatösen Meningeomen beobachtet. In 4 fibromatösen Tumoren sind die zelligen Areale von bindegewebigen Räumen umgeben. Auch wenn die meisten Tumorzellen helle Zellen sind und sich nicht wesentlich von den Tumorzellen der endotheliomatösen Meningiome unterscheiden, ist die histologische Anordnung der fibromatösen klar von derjenigen der endotheliomatösen Meningeome zu trennen. Ausschlaggebend dafür ist die starke Entwicklung des Bindegewebes. Die Dunkelzellen lassen sich in zwei Typen gliedern: Typ I wird in vier Tumoren mit stark ausgebildetem Bindegewebe angetroffen. Die Analyse der inneren Zellstruktur sowie das Vorliegen von Übergängen zwischen hellen und dunklen Zellen machen es wahrscheinlich, daß diese nur verschiedene Typen einer einzigen Ursprungszelle darstellen. Die Bedeutung dieser verschiedenen Erscheinungsformen der Meningiomzellen wird diskutiert. Die Ultrastruktur der Tumorzellen ähnelt derjenigen der normalen arachnoidalen Zellen. Rückschlüsse auf die blastodermale Herkunft der normalen und tumoralen meninigalen Zellen auf Grund ihrer ultrastrukturellen Merkmale erscheinen verfrüht.

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Cervós-Navarro, J., Vazquez, J.J. An electron microscopic study of meningiomas. Acta Neuropathol 13, 301–323 (1969). https://doi.org/10.1007/BF00686120

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