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Two types are met with: one in which dilatation of a large superficial vein and its tributaries is the most obvious feature; the other, in which bunches of distended and tortuous vessels develop at one or more points in the course of a vein, a condition to which Virchow applied the term angioma racemosum venosum. The two types may occur in combination.
The angioma racemosum venosum is probably also due to a congenital alteration in the structure of the vessels, and is allied to tumours of blood vessels.
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