Designation and classification of the vascular neoplasms of the brain and meninges have not been established to the satisfaction of all neuropathologists. Angioblastic meningioma, hemangiopericytoma, hemangioendothelioma, cerebellar hemangioblastoma and vascular sarcoma are all graded into each other as judged histologically, and somewhat it resembles some of vascular malformations. The application of electron miscroscope to the problem of distinguishing among the vascular tumors of the brain and meninges offers an additional source of information. These two cases of the brain tumors are malignant hemangiopericytoma, but rather one is more satisfactory to designate angioblastic meningioma. All of these tumors were located in the parieto-occipital lobe subcortically and also attached to the falx cerebri. In spite of surgical removal of these tumors, the tumor masses were regrowing very rapidly and needed surgical intervention again 3 months after previous operation.