A benign, intermediate, or malignant neoplasm arising from vascular tissue including arteries, veins, venous sinuses, lymphatic vessels, arterioles and capillaries. It may occur in essentially any body location and is characterized by the presence of vascular channel formation and endothelial cells. The disease is vascular neoplasm (MONDO_0024296). Also known as: neoplasm of vascular system, neoplasm of vascular tissue, neoplasms, vascular, tumor of vascular system, tumor of vascular tissue, tumors, vascular, tumour of vascular system, tumour of vascular tissue.