Studies on mucous substances in myxomatous meningiomas

Three cases of myxomatous meningiomas with unusually abundant myxopoiesis are reported. Histochemical and staining methods are applied to characterize the mucous substances. They are identified as a complex of neutral and acid mucopolysaccharides with a protein component. Histochemical and histological findings are correlated. The question is discussed whether an excessive myxopoiesis of meningioma cells represents regressive changes or specialized cellular activity.