Meningioma cells are derived from benign tumours (meningiomas) of the human leptomeninges and they share the same morphology, cytological structure and expression of cell markers (desmosomal desmoplakin, cytokeratin, vimentin and epithelial membrane antigen) as normal leptomeningeal cells [363,364,365]. This evidence concerns the gene MUC1 and meningioma.