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A fistula is defined as a communication between two major organs. A Rectovaginal Fistula (RVF) is a tract or hole between the rectum and the vagina. It allows the involuntary passage of faeces from the rectum through the vagina. Watch The Doctors TV: Rectovaginal Fistula explained.
Normally, blood flows from arteries into capillaries and then into veins. When an arteriovenous fistula is present, blood flows directly from an artery into a vein, bypassing the capillaries.A person may be born with an arteriovenous fistula (congenital fistula), or a fistula may develop after birth (acquired fistula).Congenital arteriovenous fistulas are uncommon.Acquired arteriovenous fistulas can be caused by any injury that damages an artery and a vein that lie side by side. Typically, the injury is a piercing wound, as from a knife or bullet. person may be born with an arteriovenous fistula (congenital fistula), or a fistula may develop after birth (acquired fistula). Congenital arteriovenous fistulas are uncommon. Acquired arteriovenous fistulas can be caused by any injury that damages an artery and a vein that lie side by side.