Immunopathological significance of Ig G in meningioma in relation to the pseudopsammoma bodies

Abstract
We described two histochemical patterns of Ig G deposits in meningioma and discussed the pathogenesis of Ig G deposits. In meningioma with pseudopsammoma bodies, Ig G was secreted from tumour cells which differentiated to secretory epithelial cells, and was found to deposit in the pseudopsammoma bodies. However, in meningioma without pseudopsammoma bodies, Ig G was derived from plasma and became deposit around the blood vessels in the meningioma tissue.