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Treatment of a CVM involves the use of a needle or catheter to inject medical grade alcohol into the malformation to embolize (obstruct) the flow of blood. Embolization can be used to shrink a large CVM to make it easier to be operated on. In some cases, surgery may be avoided altogether. Sometimes the treatment requires several stages to fully eradicate the entire malformation. The specific procedure will depend on the type of CMV you have.