الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
Before the era of Computed Tomography (CT) and Magnetic Resonance (MR) scanning, angiography was the prime tool for diagnosing venous sinus obstruction. At times, even with these modalities, angiography may still be necessary in the accurate diagnosis of this entity, particularly in cases with previously thrombosed and recanalized vessels. ¢ On arteriography, the arterial flow may be normal or delayed and the venous phase may show collaterals or retrograde filling of veins and sinuses, or they may fail to opacity. Magnetic resonance venography (MR V) is a newly introduced modality which provides a fast, and noninvasive technique that doesn’t require the use of exogenous contrast material yet gives anatomical and functional depiction of the intracranial venous system. It is a useful tool in the diagnosis and analysis of intracranial venous compressive lesions. Moreover, the clinical utility of intracranial MRV depends on its excellent visualization of the dural venous sinuses with multiplanner display capability. It delineates the venous drainage pattern and dural sinus occlusion by tumours before surgery. Also, it