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Liver size should be approximately 5cm vertical length in his age. AVM of the liver is an abnormal connection of the arteries and veins which cause organ damage and in most cases cardiac failure. Since it is in the liver, the Doctor can explain various treatment methods like embolization where they block this abnormal blood vessels. Also if there are many AVMs in the liver, liver transplantation
may be required in some cases. He is having bruising because pf diffuse liver damage
. As of now your son needs Vitamin K injections to prevent bleeding and bruising. Speak to your Doctor regarding the available treatment options.