The fallopian tube is the place where the egg and sperm unite and the channel for transporting the fertilized egg. Depending on its shape, the fallopian tube is divided into four parts: the interstitial part, the isthmus, the abdomen and the umbilicus. Causes and classification of tubal diseases Tubal diseases cause about 25%-40% of female infertility. The sequelae of pelvic inflammatory disease are the main cause of tubal infertility, accounting for more than 50% of tubal infertility. The incidence of infertility increases with the number of cases of pelvic inflammatory disease. Tubal disease is divided into two main categories according to location 1. proximal (interstitial and isthmus) tubal disease: causes include pelvic inflammatory disease, debris and mucus plugs in the tubes, congenital malformations, endometriosis, and nodular isthmus; 2. distal (abdominal and umbilical) tubal disease: causes include tubal inflammatory disease, history of tubal ligation, history of previous surgical procedures, and endometriosis. Hysterosalpingogram Hysterosalpingogram is performed by injecting contrast into the uterus and fallopian tubes through a catheter placed in the uterine cavity, and taking X-ray fluoroscopy and radiographs to determine the site of tubal obstruction, the presence of hydrosalpinx and uterine cavity lesions based on the contrast image in the uterine cavity, fallopian tubes and pelvis. The test is less invasive and can make a more correct diagnosis of the fallopian tubes with an accuracy rate of up to 80% and has certain therapeutic effects. It is currently one of the most common and important methods of tubal examination. Indications 1.To understand whether the fallopian tubes are patent and their morphology and obstruction site. 2.To understand the morphology of the uterine cavity, to determine the presence or absence of uterine malformations and types, the presence or absence of uterine adhesions, submucosal fibroids, endometrial polyps and foreign bodies, etc. 3.Inactive stage of internal genital tuberculosis. Contraindications 1, acute or subacute inflammation of internal or external genitalia. 2.Serious systemic diseases that cannot tolerate surgery. 3.Pregnancy, menstrual period. 4.Postpartum, abortion, within 6 weeks after curettage. 5.Iodine allergy. Time of examination The time of imaging should be 3-7 days after menstruation (sexual intercourse is prohibited after menstruation). Post-operative precautions 1.After imaging, it is forbidden to take a tub bath and have sex for two weeks, pay more attention to hygiene to avoid inflammation and infection. 2. Give antibiotics as appropriate to prevent infection. 3.A small amount of vaginal bleeding within one week after the contrast examination is normal if there is no other discomfort, but if the bleeding is more than the amount of menstruation or there is other discomfort, you should contact with the doctor.