First, let’s see what a nutcracker looks like, those who love to eat small walnuts are probably familiar with this: anatomical diagram (light blue for veins, red for arteries) Nutcracker phenomenon: enhanced CT transverse axis view The left renal vein (L Renal Vein) can be seen to be significantly squeezed by the superior mesenteric artery (SMA) and the aorta (Aorta). Nutcracker syndrome (NCS), also known as “nutcracker phenomenon”, “renal vein compression syndrome” or “compression of the left renal vein by the mesenteric aorta “. Most of them are caused by compression of the left renal vein between the superior mesenteric artery and the aorta. This name comes from the fact that, when viewed from the side, the aorta and the mesenteric artery pinch the left renal vein like a nutcracker on a pecan. Of course, other causes can also cause compression of the left renal vein. A common symptom of NCS is blood in the urine and proteinuria, which can lead to anemia. There is also abdominal pain, especially on the left side of the lower back and abdomen, which can radiate to the back of the thighs or buttocks, and is worse when walking, sitting or standing, or in a rocking car. Sometimes there may be left-sided testicular pain and varicocele. In women, this may manifest as left-sided abdominal pain. It can also be accompanied by nausea and vomiting. Patients with the condition feel fatigued easily The disease is common in women and has been reported from children to 70 years of age. Especially during 2 and 30 years of age. The diagnosis of the disease can be made by CT, MR , ultrasound DU, etc., but other kidney diseases need to be excluded. Treatment In adolescents under 18 years of age, conservative treatment (angiotensin inhibitors) for at least 2 years will result in complete remission in 75% of patients. For patients who are still symptomatic after two years of conservative treatment, open surgical treatment can be performed.