A malignant vascular neoplasm arising from the prostate. The disease is prostate angiosarcoma (MONDO_0003033, a Monarch Disease Ontology id). Also known as: angiosarcoma (disease) of prostate gland, angiosarcoma of prostate, angiosarcoma of the prostate, hemangiosarcoma of prostate, hemangiosarcoma of the prostate, prostate gland angiosarcoma (disease), prostate hemangiosarcoma, prostatic angiosarcoma.