The uterus can sometimes have an abnormal shape. This is because of failure of complete development in embryological life. During embryological life the womb forms by fusion of two cords of tissue either side of the body called the Mullerian tracts. If there is a mild fusion abnormality a small septum can exist down the middle of the uterus and this is calle a 'septate' uterus. In it's extreme form the uterus can be completely double with each side having a tube, body and cervix. This is called a 'didelphine' uterus and can be associated with a double vagina also. In between the two is a 'bicornuate' uterus which is heart shaped.

Often these abnoramlities are not recognised. However, sometimes in menstrual life they can cause heavy periods due to an increase in the surface area of the womb. They can result in problems with conceiving and possibly in miscarriage. In adition, women with Mullerian abnormalities are more likely to have a breech baby when pregnant.

Treatment is rarely necessary although sometimes surgical correction is required. A test of the kidney tract is also recomended when these are discovered as often these abnormalities go together.