Hemangiosarcoma

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Hemangiosarcoma
Hemangiosarcoma of the spleen in a dog, removed after surgery
Specialty	Veterinary medicine

Hemangiosarcoma is a rapidly growing, highly invasive variety of cancer that occurs almost exclusively in dogs, and only rarely in cats, horses, mice,^[1] or humans (vinyl chloride toxicity). It is a sarcoma arising from the lining of blood vessels; that is, blood-filled channels and spaces are commonly observed microscopically. A frequent cause of death is the rupturing of this tumor, causing the patient to rapidly bleed to death.

The term "angiosarcoma", when used without a modifier, usually refers to hemangiosarcoma.^[2] However, glomangiosarcoma (8710/3) and lymphangiosarcoma (9170/3) are distinct conditions (in humans).