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Plasma cell granuloma : ウィキペディア英語版
Plasma cell granuloma
Plasma cell granuloma is a lesional pattern of inflammatory pseudotumour, different from the "inflammatory myofibroblastic tumor" pattern.
It is linked to IgG4-related disease.
== Pathology ==
Histologically, the lesions consisted of a proliferation of mature plasma cells and reticulo-endothelial cells supported by a stroma of granulation tissue, with varying degrees of myxoid change or collagenization. Angioinvasion within the lesion is observed in 50% of cases.
Immunohistochemical staining reveals the IgG-predominant polyclonal nature of the plasma cells, indicating a reactive inflammatory process rather than a neoplastic one.
Electron microscopy confirms the benign nature of the plasma cells with fibroblast and myofibroblast proliferation admixed with that of other inflammatory cells.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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