CD68 and periventricular leukomalacia: Variation in the glial phenotype across WML subtypes defined by their anatomical location has already been reported, with significantly more CD68+ microglia present in DSCL (22, 39), MHC‐II+ microglia in PVL (22) and CD astrocytes, associated with BBB leakage, a prominent feature of PVL (21).