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(a) Histological section of meninges and underlying brain, showing cellular infiltration of the meninges penetrating perivascular Virchow–Robin spaces into the cerebral cortex (haematoxylin-eosin); and (b) monotonous polygonal cells with prominent nuclei. The neoplastic cells are positive for melanocytic markers (c) HMB-45; and (d) MART-1 (immunohistochemistry).
