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Where is the abnormality?
The left renal vein appears entrapped between the aorta and superior mesenteric artery, causing its stenosis.
Which is the condition with a similar etiology?
Superior mesenteric artery (Or Wilkie's syndrome), where the third part of duodenum is entrapped between the aorta and SMA.
Although not obvious in this case, which collateral pathway may be seen commonly in this condition?
The left gonadal vein serves as a main collateral channel.
There is a reduced aorto-mesenteric angle, with entrapment of the left renal vein and significant stenosis.