The sonohysterogram (SHG) is similar to the hysterosalpingogram (HSG) in that it helps us to evaluate the uterine cavity. But, with the SHG, saline rather than an X-ray dye is instilled into the uterus and the progress of the saline is tracked with ultrasound rather than X-ray. The SHG provides clear views of the uterine muscle along with the endometrial cavity. Thus, we are able to see abnormalities like fibroids by SHG that cannot be seen by HSG. Also, by using ultrasound, we can utilize new 3D ultrasound technology that allows us to rotate the image of the uterus to obtain the best diagnostic picture. Even the most subtle abnormalities can be clearly seen with SHG allowing for accurate treatment planning. Unfortunately, the SHG does not provide any information on the fallopian tubes so it cannot replace the HSG.

Both the HSG and the SHG are useful before planning a laparoscopy or hysteroscopy. The information obtained aids in planning intraoperative treatment procedures.