hemangiosarcoma

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he·man·gi·o·sar·co·ma

(hē-man'jē-ō-sar-kō'mă),
A rare malignant neoplasm characterized by rapidly proliferating, extensively infiltrating, anaplastic cells derived from blood vessels and lining irregular blood-filled or lumpy spaces.

hemangiosarcoma

/he·man·gio·sar·co·ma/ (-sahr-ko´mah) a malignant tumor of vascular origin, formed by proliferation of endothelial tissue lining irregular vascular channels.

hemangiosarcoma

angiosarcoma

An uncommon, aggressive mesenchymal malignancy, arising in the skin, liver, breast, soft tissues and viscera, primarily affecting the elderly; male:female, 2:1.Aetiology Most are idiopathic; some are linked to chronic lymphoedema (as occurs following axillary dissection for breast CA), others to radiation therapy; hepatic angiosarcoma is classically linked exposure to thorium dioxide (a long obsolete contrast medium), and is also associated with arsenic and vinyl chloride. 
Prognosis Poor, 10–20% 5-year survival.

he·man·gi·o·sar·co·ma

(hē-man'jē-ō-sahr-kō'mă)
A rare malignant neoplasm characterized by rapidly proliferating, extensively infiltrating, anaplastic cells derived from blood vessels and lining irregular blood-filled or lumpy spaces.
Synonym(s): haemangiosarcoma.

hemangiosarcoma

a malignant tumor of endothelial cells characterized by extensive metastasis, being cavitatious and bleeding profusely if cut. Occurs in spleen, liver, skin, right atrium and muscle. It can cause severe hemorrhagic anemia by bleeding internally. Common in German shepherd dogs. Called also angiosarcoma.
Enlarge picture
Hemangiosarcoma in liver. By permission from Knottenbelt DC, Pascoe RR, Diseases and Disorders of the Horse, Saunders, 2003