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Rapid circulation in intracranial meningiomas.

Rapid tumor circulation with early filling of veins draining the tumor has been considered an unusual pattern in the angiographic diagnosis of intracranial meningiomas. A retrospective analysis demonstrated early venous filling in 15 of 40 such lesions (37.5%). Locations with a relatively higher incidence of rapid circulation included the frontal and parietal convexities and the anterior portion of the middle cranial fossa. There was a high correlation between early appearance of a tumor stain and rapid tumor circulation, although 2 lesions with early venous filling exhibited no stain. Histologically, the angioblastic type of meningioma showed the highest incidence of rapid circulation.