title: Extramedullary hematopoiesis in a malignant meningioma.
abstract: 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.
mesh_terms: D001929:Brain Edema / Q000473:pathology; D002196:Capillaries / Q000473:pathology; D004900:Erythroblasts / Q000648:ultrastructure; D006410:Hematopoiesis; D006801:Humans; D008297:Male; D008577:Meningeal Neoplasms / Q000473:pathology* / Q000601:surgery; D008579:Meningioma / Q000473:pathology* / Q000601:surgery; D008875:Middle Aged