A benign vascular lesion characterized by the presence of a complex network of communicating arterial and venous vascular structures. The disease is Monarch Disease Ontology id MONDO_0001256 (arteriovenous hemangioma/malformation). Also known as: arteriovenous angioma, arteriovenous hemangioma, racemose aneurysm, racemose aneurysm (morphologic abnormality), racemose angioma, racemose hemangioma, racemose hemangioma (morphologic abnormality).