Abstract
The complicated development of the inferior vena cava is responsible for numerous anomalies of the abdominal veins, since four of the veins present at varying stages of embryonal life take part in its formation. Among these anomalies the passage of the left renal vein behind the aorta has received least attention in medical literature, and I have succeeded in finding only sixteen instances of the condition reported.1Darrach,2in 605 dissections of the cat, an animal in which the venous system is prone to many variations, make no mention of this condition, and the character of the examination reported by Darrach leaves no doubt in the mind of the reader that had such an anomaly been present it would have been observed. It is well known that the early symmetrical distribution of the venous channels in the embryo is soon lost. Ventral to each postcardinal vein, branches coming

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