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'''Renal Nutcracker Syndrome''' ...e compression of the [[left renal vein]] between the [[superior mesenteric artery]] and the [[aorta]], leading to various symptoms such as hematuria and flan

...in males. The term "nutcracker" is derived from the appearance of the left renal vein being compressed like a nut in a nutcracker. ...pper abdomen and the back. It can be caused by the compression of the left renal vein.