Intracranial Venous Angiomas
Venous angiomas are defined as consisting of venous structures only, without arterial or capillary components. According to Fierstein et al. , venous angiomas are devoided of large quantities of smooth muscle and elastic tissue; hyalinization and thickening of the walls are common. The first report on a venous angioma demonstrated by angiography came in 1967  and described a structure consisting of a collection of fine dilated medullary veins converging into a central vein draining into a superficial or deep venous system. In 1981, Saito and Kobayashi  were the first to propose that venous angiomas are formed as a result of maldevelopment of the medullary veins and their tributaries during embryogenesis. The actual incidence of venous angiomas is unknown but current consensus is that with the availability of gadolinium the detection rate of venous angiomas will undoubtly increase.
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