[Peritumoral edema in intracranial meningiomas. Angiographic and computerized tomographic correlations].

On computerized tomography the intracranial meningiomas are surrounded by a more or less extensive peritumoral oedema. Twenty patients presenting with a supratentorial meningioma have been studied by angiography and computerized tomography. A constant correlation between the presence of oedema and the type of vascular supply of the tumor has been demonstrated. When there is no oedema, the whole vascular supply of the tumor is provided by the meningeal branches of the external or the internal carotid arteries. When there is a peritumoral oedema, the vascular supply of the portion of the tumor adjacent to the oedema is provided by leptomeningeal branches of the internal carotid. No constant correlation has been demonstrated by the authors between the presence of oedema and the other factors previously described in the literature.