Pelvic congestion syndrome (PCS) is caused by pelvic varicose vein stasis, which is characterized by “three pains, two more and one less”: long-term lower abdominal pelvic pain, low back pain, deep intercourse pain, heavy menstrual flow, increased leucorrhea, and less positive gynecological examination signs. The concept of PCS was first introduced by Richet in 1857 as “a series of discomfort syndromes such as chronic dull pain, pressure and heaviness in the lower abdomen due to venous backflow caused by ovarian venous valve dysfunction”. Patients may have varying degrees of pelvic pain, including lower abdominal pain, pelvic distension, vaginal tingling, vulvar and anal swelling and even involvement of the lumbosacral region and lower limbs, increased menstruation, increased leucorrhea, discomfort during sexual intercourse, frequent urination, some accompanied by dizziness, palpitations, insomnia, fatigue and other symptoms of plant nervous disorders. PCS has the characteristics of “three pains, two more and one less”, i.e. patients have heavy symptoms and complaints, while gynecological examination shows few positive signs except for occasional blue-purple vaginal wall bruising, which leads to clinical misdiagnosis and mismanagement, and is easily misdiagnosed as The cause of PCS may be due to compression of nerve fibers by the accompanying tortuous veins. The causes of PCS are complex, firstly, anatomically, the left ovarian vein converges at a right angle into the left renal vein and subsequently into the inferior vena cava, which is compressed by the aorta and superior mesenteric artery. Therefore, the left ovarian vein often has varicose veins due to poor reflux. The right ovarian vein injects directly into the inferior vena cava at an acute angle. Secondly, the pelvic veins are thin-walled, less elastic and more easily dilated. The venous plexus around each pelvic organ, such as ovarian plexus, uterovaginal plexus and vesicovaginal plexus, communicate with each other and affect each other. Third, the ovarian veins dilate significantly during pregnancy to relieve pressure on the uterine vasculature, and the ovarian capillary volume expands up to 60 times and continues to do so until several months after delivery, with severe ovarian vein dilation posing irreversible damage to venous valve function. Ovarian venous valve deficiency is also a cause of PCS. Especially in menstrual women, the rate of ovarian vein valve agenesis is 15% on the left side and 6% on the right side. Fourth, posterior position of uterus, injury of uterine broad ligament fascia caused by childbirth, early marriage, early childbirth, too frequent sexual life and multiple abortions can lead to pelvic vein stasis and edema. Other factors: such as prolonged standing, heavy physical labor, etc. Recent studies have concluded that, among the above factors, anatomical factors are the most important cause of PCS. Preferred ultrasound examination, which can be seen as thickened strips or patches of red and blue blood flow, shows more clearly when standing, because it is inexpensive and non-invasive can be the preferred method of PCS screening. If the ultrasound does not show abnormalities, further CT or MRI examinations can be performed to enhance the scan of dilated and tortuous pelvic veins with tumor-like dilated vessels. Retrograde ovarian venography, which shows bruising in the ovarian plexus, is now considered the gold standard for the diagnosis of PCS. Ovarian venography is not recommended as a screening tool alone, but should be part of the pre-interventional embolization treatment. Previous surgical methods for PCS include hysterectomy and hysterectomy, but the results are poor and prone to recurrence. In the early 1980s, PCS was treated with ligation or excision of varicose vein masses, which had some effect. Reginald et al. reported that the success rate of ovarian vein embolization technique is 96%~100% and the efficiency rate after ovarian vein embolization is 75%~100%, the difference in efficacy may be related to the different criteria of indications mastered by the operator. Before embolization, the upper, middle and lower segments of the ovarian vein and the inferior vena cava, and the bilateral internal iliac veins should be imaged respectively, so that a comprehensive understanding of the presence or absence of collateral draining veins is very important. Embolization should begin at the beginning of the ovarian vein and continue to the level below the opening of the ovarian vein-renal vein, and all lateral branches should be embolized as well. The embolization should be followed by a review of the imaging to ensure complete embolization and avoid recurrence. The literature reports that embolization of only the left ovarian vein is sufficient in 90-95% of patients; when preoperative examination confirms bilateral varicose veins, then bilateral embolization should be performed. Timing of intervention: 1 to 2 weeks before menstruation. After local anesthesia, the right femoral vein is punctured and the aqueduct guidewire is passed through the femoral vein, right external iliac vein and common iliac vein to reach the inferior vena cava, and a 5 F Cobra catheter is introduced along the guidewire to the inferior vena cava, the left ovarian vein opening to the left renal vein and the right ovarian vein opening to the inferior vena cava. Pressure was measured. The head of the catheter was placed at the beginning, middle and near the ovary of the ovarian vein, and retrograde imaging of the left and right ovarian veins was performed respectively. To increase abdominal pressure during the imaging, the patient was instructed to perform Valsalva breathing. If the ovarian vein was not visualized, the catheter sheath was removed and pressure bandaged after the successful embolization was confirmed. The patient was discharged from the hospital 6h after the procedure and three days later. Interventional embolization of ovarian vein is safe, simple, easy to perform, with definite efficacy. It can be performed immediately after the diagnosis is clear on the imaging, and a single treatment can solve the problem, which is effective for moderate and severe cases, and is the preferred treatment method.