AIF1 and myeloid sarcoma: Similar to the findings for T and B cells, we also found a wide dynamic range of the meningeal count of IBA1+ myeloid cells (range: 11.76–34.64 cells/mm meninges) (CD68+ cell range: 17.01–62.57 cells/mm meninges; median 27.89 cells/mm meninges) in MS cases.