Dictionary

vascular bed The vascular system, or a part thereof. For example, the pulmonary vascular bed describes the blood vessels of the lungs.

vascular Relating to blood vessels. For example, the vascular system in the body includes all of the veins and arteries. And, a vascular surgeon is an expert at evaluating and treating problems of the veins and arteries.

vasa previa A condition in which blood vessels within the placenta or the umbilical cord are trapped between the fetus and the opening to the birth canal. Vasa previa carries a high risk that the fetus will die from blood loss due to a vessel tearing at the time the fetal membranes rupture or during…

vas deferens The tube that connects the testes with the urethra. The vas deferens is a coiled duct that conveys sperm from the epididymis to the ejaculatory duct and the urethra.

varix An enlarged and convoluted vein, artery, or lymphatic vessel. Treatment of varices depends on where they are and whether they are causing problems. A varix in the esophagus can be caused by severe liver disease and can lead to bleeding. This form of varix can require treatment to prevent dangerous bleeding.

variola See smallpox.

varicosity 1 An enlarged and tortuous vein, artery, or lymphatic vessel. 2 Specifically, a varicose vein.

varicose vein A vein that has enlarged and twisted, often appearing as a bulging, blue blood vessel that is clearly visible through the skin. Varicose veins are most common in older adults, particularly women, and occur especially on the legs. Varicose veins can cause cramping pain and movement problems, or they may simply be a…

varicocele Elongation and enlargement of veins within the network of veins (pampiniform plexus) that leave the testis to form the testicular vein. A varicocele appears bluish through the scrotum, feels like a bag of worms, and can cause pain or discomfort.

varicella vaccination See chickenpox immunization.

varicella See chickenpox.

variant angina See angina, Prinzmetal.