Plate from 18th century encyclopedia showing an illustration of the systems of veins and arteries in the field of angiology, the medical specialty which studies the diseases of the circulatory and lymphatic system. In the UK this field is more often termed angiology, and in the United States the term vascular medicine is more frequent. The field of vascular medicine (angiology) is the field that deals with preventing, diagnosing and treating vascular and blood vessel related diseases. The field of vascular medicine (angiology) is the field that deals with preventing, diagnosing and treating vascular and blood vessel related diseases..