The pregnancy cannot develop normally and this may lead to a miscarriage. Repetitive miscarriages can also occur if the uterus has an abnormal shape. A normal uterus is shaped like a small pear turned upside down. And a normal uterine cavity has a triangular shape. During development of a female embryo, separate parts fuse together to produce a normal uterus and Fallopian tubes.
Abnormal structures result if one of the parts fails to develop, or if the fusion is incomplete.
If only one side develops, the uterus may be shaped like a comma and there may be only one Fallopian tube. Problems with fusion may lead to a wall or septum inside the uterine cavity which divides it into two smaller sections. The procedure can be a little uncomfortable, so have your daughter check with her doctor about taking something for cramps ahead of time. While no one wants to find a problem on an HSG, you want to find an explanation for the miscarriages. And fortunately, most problems found on HSG are correctable with surgery.