How are vascular tumors classified? Professor Dong, my child developed a 2.5*2 cm vascular tumor on the right scapula at about two weeks old, which was initially flat on the skin. At 42 days, a large swelling the size of an egg appeared beneath the skin, with the surface vascular tumor protruding above the skin. Now, three and a half months later, the vascular tumor is slowly growing, but not very quickly.