When many of you get the report of hysterosalpingogram (HSG), you will ask the question: Where is the obstruction site? Why is it important to know the site of obstruction? Because it is generally believed that laparoscopy is needed for adhesions at the umbilical end of the fallopian tube; tubal intervention is done for proximal blockage or isthmus blockage; other cases such as open but poor or open but very poor are not known, and they are afraid to try to conceive for fear of ectopic pregnancy. In other cases, such as obstruction of the interstitial part, isthmus, and abdominal region, as well as adhesions, occlusion, or fluid accumulation at the umbilical end, the site will be indicated. In general, the difference in patency, patency, and patency is the difference in the degree of patency of the fallopian tubes, not the location of the blockage. In fact, the conditions suitable for SSG (or tubal intervention) include: 1. interstitial tubal obstruction; 2. tubal isthmus obstruction; 3. tubal patency but not patency; 4. tubal patency but not patency; 5. high tubal tone, slightly patency or patency or patency but not patency; 6. mild adhesions at the umbilical end of the fallopian tube, patency but not patency; 7. bilateral horn obstruction, etc.