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Vanishing twin syndrome is a condition in which one of two fetuses disappears sometime during the first 12 weeks of a pregnancy

A varicocele is an enlarged, twisted vein (varicose vein) in the scrotum, most often on the left side. It may feel something like

Varicose veins are twisted, enlarged veins near the surface of the skin. They're most common in the legs and ankles. They usually

The vas deferens is a narrow, muscular tube that connects the testicles (where sperm is produced) to the urethra. During

Vasculitis is inflammation of the blood vessels. This inflammation can damage and narrow the blood vessels, causing a rash, a

A vasectomy is surgery to make a man sterile (permanently unable to father a child). During a vasectomy, the tube that carries

A vegan is a person who eats only fruits, grains, nuts, seeds, vegetables, and plant products and consumes no animal or dairy

Venous insufficiency occurs when the veins in the legs do not return blood to the heart and upper body normally. Causes include

The ventricles are the two lower chambers of the heart, one on the right and one on the left. The ventricles receive blood from

Vertebrae are the bones that make up the spine, or backbone. A person usually has 33 vertebrae aligned in a column, with one on