Abstract: The chtomosomes karyotype analysis have been done by 10 brain tumors.The chromosome preparations were made from each tumor cells cultured during the logari-thmic phase.Endoreduplication was frequenty found in 8 tumors.4 out of 5 meningiomas have the typical karyotype showing ^*22 monosomy,3 of them showed chromosome aberration. 3 of the malignant glial tumor have showed same aberration as the 3 meningiomas but the neartetraploid karyotype of the glioblastoma multiforme was more than the other two glial tumors.

Key words: chromosome preparations, human brain tumor, karyological analysis