Dictionary.net

A malignant tumor originating from the endothelial cells of lymphatic vessels. Most lymphangiosarcomas arise in an arm secondary to radical mastectomy but they sometimes complicate idiopathic lymphedema. The lymphedema has usually been present for 6 to 10 years before malignant changes develop. (From Dorland, 27th ed; Holland et al., Cancer Medicine, 3d ed, p1866)

A neoplasm containing the elements of a lymphangioma and those of a sarcoma.

A growth arising from the endothelium of the lymph vessels in a lymph gland.