"Dandy-Walker malformation 6,7"
"In addition to, or instead of, leptomeningeal involvement, parenchymal changes are seen in some individuals, characterised by T1 signal hyperintensity in the mesial temporal lobes (particularly the amygdala), ventral pons and medulla, cerebellum, and inferior frontal lobes 6,7. It is believed this is due to melanocytes tracking along perivascular spaces 7."