[Diffuse Melanocytosis is a diffuse or multifocal proliferation of uniform nevoid polygonal cells in the leptomeninges. Cells may spread into the Virchow-Robin spaces without frank invasion of the brain. Diffuse Melanocytosis carries a poor prognosis even in the absence of histologic malignancy. (WHO) ( NCI )]
UMLS (NCI) C1266112Diffuse Melanosis
Diffuse Meningeal Melanocytosis