Nō to shinkei = Brain and nerve
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The authors report on the relationship between occlusion or stenosis of the deep cerebral veins and sinuses and the development of collateral venous channels in pineal region tumors. Five cases of meningioma arising from the falcotentorial junction were the subject of this study. There were two males and three females with an average age of 51.2 years (range: 26-67). ⋯ The first three types of collateral venous channels seem to be important following occlusion or stenosis of deep cerebral veins and sinuses. Stereoscopic angiograms are essential to analyze deep venous channels around deep-seated tumors. Clear identification of occlusion or stenosis and the development of venous system collaterals on angiograms is important to the surgical treatment of pineal region tumors.