Retroaortic left renal vein: an interpretive pitfall on computed tomography.

In a patient with retroaortic left renal vein, the anomalous vessel is demonstrated by computed tomography to take a caudal course of several centimeters before crossing in a retroaortic fashion to join with the inferior vena cava. This case differs from previously published reports. Computed tomography provided excellent anatomic details of the vascular anomaly and highlighted the value of postcontrast dynamic computed tomography scanning.