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Lipidized meningothelial tumor cells in "xanthomatous" meningioma express macrophage antigen
1Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City 66160-7410.
Abstract:
A case of "xanthomatous" meningioma was examined by light and electron microscopy as well as immunohistology. Lipid-laden "xanthomatous" cells were shown to be meningothelial by all ultrastructural criteria. All tumor cells (lipidized and non-lipidized) expressed vimentin in their cytoplasm, but only the lipidized cells showed the presence of the macrophage marker HAM-56. This finding suggests that, as in some other areas of general pathology, immunological markers may serve as indicators of a specific activity (in this case phagocytosis), rather than merely histogenesis.
Insights
This study examined a xanthomatous meningioma, revealing lipid-laden cells were meningothelial. Macrophage markers indicated phagocytic activity, suggesting markers reflect cell function over origin.
Area of Science:
- Neuropathology
- Immunohistochemistry
- Electron Microscopy
Background:
- Meningiomas are tumors arising from the meninges.
- Xanthomatous changes in meningiomas involve lipid accumulation within tumor cells.
- The histogenesis and cellular characteristics of xanthomatous meningiomas require further elucidation.
Observation:
- A case of xanthomatous meningioma was analyzed using light and electron microscopy and immunohistology.
- Lipid-laden cells within the tumor met ultrastructural criteria for meningothelial cells.
- Tumor cells, both lipidized and non-lipidized, expressed vimentin.
Findings:
- Lipidized xanthomatous cells uniquely expressed the macrophage marker HAM-56.
- Vimentin was present in the cytoplasm of all tumor cells.
- Immunohistochemical analysis differentiated cell activity.
Implications:
- Immunohistochemical markers like HAM-56 may indicate specific cellular functions, such as phagocytosis, in meningiomas.
- This finding suggests that immunological markers can reflect cellular activity rather than solely histogenesis.
- Understanding the functional role of lipidized cells in meningiomas can inform diagnostic and potentially therapeutic strategies.