胡桃夹综合征也称胡桃夹现象或左肾静脉压迫综合征,多见于青少年。本病是由于左肾静脉注入下腔静脉时需穿行腹主动脉与肠系膜上动脉之间所形成的夹角,跨越腹主动脉前方才能注入下腔静脉。正常时,此夹角为45°~60°或宽约4.5mm[1],被腹膜后脂肪、十二指肠第三段、淋巴结及腹膜等 Nutcracker syndrome, also known as nutcracker syndrome or left renal vein compression syndrome, more common in adolescents. The disease is due to the left renal vein into the inferior vena cava need to run through the abdominal aorta and superior mesenteric artery formed between the angle across the front of the abdominal aorta can be injected into the inferior vena cava. Normal, the angle of 45 ° ~ 60 ° or width of 4.5mm [1], was retroperitoneal fat, duodenal third, lymph nodes and peritoneal