Intrauterine adhesions, or intrauterine synechiae, are a condition in which scar tissue develops within the uterine cavity. Intrauterine adhesions accompanied by symptoms (e.g. infertility, amenorrhea) are also referred to as Asherman syndrome. The degree of adhesion formation and the impact of the adhesions on the contour of uterine cavity vary greatly. With minimal disease, thin bands of tissue stretch between surfaces of the uterine cavity, whereas severe disease is characterized by complete obliteration of the cavity, with the anterior wall of the uterus densely adherent to the posterior wall. These may impede menstrual flow or interfere with conception or pregnancy.