Intraosseous Lipomatous Meningioma

Figure 3

(a) Lipomatous meningioma with bone invasion and formation of cyst-like space (lower left). (b) Meningothelial foci interspersed with vacuolated lipomatous areas with cells resembling mature adipocytes. (c) Adipocyte-like cells stain for S100. (d) Interface between meningioma and normal fat shown by progesterone receptor staining (following decalcification process).

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