The septate uterus contains a ridge of tissue that protrudes into the uterine cavity. In a septate uterus the inside is the shape of a heart rather than the normal triangle. The outside of the uterus appears normal. This occurs in approximately 1 in 400 women and is a common cause of miscarriage.

The treatment of a septate uterus is usually outpatient hysteroscopic surgery where the septum is cut with a scissor through a hysteroscope (a small scope passed through the vagina into the uterus). The use of ultrasound at the time of surgery may help lead to a more complete surgery and is particularly useful in complicated cases.