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==Description==

==Description==

A highly malignant tumour of vascular endothelial origin. They commonly affect dogs and the most frequently affected areas are the spleen, pericardium, right atrium, liver and muscle. The origin of '''abdominal haemangiosarcoma''' is often from the spleen.   

A highly malignant tumour of vascular endothelial origin. They commonly affect dogs and the most frequently affected areas are the spleen, pericardium, right atrium, liver and muscle. The cat is affected less frequently and the most common sites are the liver, spleen and mesentry. Metastasis occurs via the haematogenous route or via rupture and transabdominal spread.  Metastatic sites include, lungs, liver, omentum and diaphram.

==Signalment==

==Signalment==

Often found in older German Shepherd Dogs and Golden Retrievers

Often found in older German Shepherd Dogs and Golden Retrievers. Domestic Short haired cats are the most commonly affected cat breed.

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