The SHG or Sonohysterogram has other names: SIS (Saline-Infusion Sonogram) and Hysterosonogram. Doctors consider the SHG to be a key test because it provides so much information regarding the uterus and the endometrial cavity.
A basic pelvic sonogram is very informative but it cannot accurately determine the presence of polyps and submucous fibroids. Often there is a suspicion based on the transvaginal pelvic sonogram but the SHG is significantly more accurate. Poma doctors have performed 2-dimensional and 3-dimensional procedures, and prefer the 3D technique due to the ability to manipulate image to get the optimal view of the cavity and the relationship to other structures both normal and abnormal.
The technique is not foolproof. Sometimes a lack adequate saline filling of the cavity or the image is simply poor quality if the uterus is very large or is severely angled. Sometimes there is not a clear view of the uterine fundus (top of the uterus) in cases of a double uterus such that doctors cannot determine if the problem is a bicornuate uterus or a septate uterus. These cases benefit from another technique called MRI (Magnetic Resonance Imaging) or even surgery – but at Poma we try to use non-invasive techniques first.
The SHG is great for the uterine cavity – about 97% as accurate as surgery but it is terrible for the fallopian tubes. The HSG (hysterosalpingogram) is great for the tubes but only 50% as accurate as surgery for the uterine cavity.