In cell cultures of 13 human meningiomas the internal structure of the nucleolus was stained by the toluidine bluemolybdate method and compared with the karyotype of the tumors.

Although some of the meningiomas had lost or gained one or more chromosomes and had undergone structural aberrations, all of them showed isonucleolinosis, which is normally found only in cells with normal karyotype.

It seems possible that the occurrence of iso- or anisonucleolinosis is not a specific sign of euploidy or aneuploidy, but of benignity or malignancy of the examined tissue.

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