A malignant vascular neoplasm arising from the spleen. The disease is MONDO_0002376 (spleen angiosarcoma). Also known as: angiosarcoma (disease) of spleen, angiosarcoma of spleen, angiosarcoma of the spleen, hemangiosarcoma of spleen, hemangiosarcoma of the spleen, spleen angiosarcoma (disease), splenic angiosarcoma, splenic hemangiosarcoma.