What is Hemangiosarcoma in Dogs Hemangiosarcoma (HSA), which is also referred to as angiosarcoma or malignant hemangioendothelioma, is a cancer of the blood vessel walls. Scientifically speaking, the cancer originates in the dog’s endothelium. The endothelium is a term that refers to the upper of tissue that surrounds the dog’s lymph nodes, blood vessels, and […]

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