OBSTRUCTION OF THE SUPERIOR SAGITTAL SINUS CAUSED BY PARASAGITTAL MENINGIOMAS - THE ROLE OF COLLATERAL VENOUS PATHWAYS

The authors present studies of eight patients who had obstruction of t he superior sagittal sinus caused by parasagittal meningioma. The resu lts indicate that meningeal veins and end-to-end anastomoses of the su perficial veins of the cerebrum play important roles as collateral ven ous pathways. This assessment suggests that, in patients with obstruct ion of the superior sagittal sinus, venous phase angiography should be carefully interpreted before surgery is attempted for parasagittal me ningiomas.