Fig. 4From: Benign meningioma manifesting with acute subdural hematoma and cerebral edema: a case report and review of the literatureMicroscopically, the tumor consists of predominant blood vessels with markedly hyalinized vascular walls (a: hematoxylin–eosin, ×200) and shows positive immunoreactivity for epithelial membrane antigen (EMA) (b: EMA, ×200) and CD34 (c: CD34, ×100), all contributing to the histopathologic diagnosis of an angiomatous meningioma of WHO grade IBack to article page