Arises form an embryogenic fault that leaves a cyst formed at the base of the tongue, which then drains through a fistula... (an abnormal or surgically made passage between a hollow or tubular organ and the body surface, or between two hollow organs) ... to the anterior surface of the neck. Are congenital defects located in or around the midline of the neck, extending to the base of the tongue. This condition may occur as an autosomal dominant trait.