Tumor infiltrating immune cells in gliomas and meningiomas

•The presence of tumor infiltrates by immune cells has been reported in both gliomas and meningiomas.•Tumor-infiltrating immune cells play a very important role in tumor development and control.•Macrophages predominate over CD8+ T-cells in association or not with natural killer- and B-lymphocytes.•Flow cytometry has been used for the identification and characterization of cell populations in tumor samples.