An unusual case of malignant intracranial meningioma is presented. The operative management was complicated by the abrupt development of fulminant brain edema and herniation. The tumor contained areas of extramedullary hematopoiesis, a finding not previously reported. Various pathogenetic mechanisms involved in intradural extramedullary hematopoiesis are discussed.
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Gregorios et al. (1983) studied this question.