Microglioma and/or reticulosarcoma of the nervous system.

49 microgliomas of nervous parenchyma were studied, all of them with aniline techniques in part of the material embedded in paraffin, and the rest with Del Rio Hortega-Polak's technique in frozen sections. It is considered that the microglia is the representative of the R.E.S. in the nervous tissue, and is characterised by its cytoplasmic argentophilia. The existence of a non-argentophilic primitive reticular cell is denied, and it is maintained that microglioma and reticulosarcoma are synonymous thus refuting the concept of the existence of a reticulosarcoma consisting of non-argentophilic cells and a microglioma consisting of argentophilic cells, as different neoplasms.