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ADDENDUM

Since submission of this paper, the one patient with recurrence has had a third study. Renal venography during a Valsalva maneuver demonstrated an additional renal collateral vein filling the ISV beyond the original site of occlusion. For this reason, we recommend that venography be performed while the balloon is inflated and the patient is performing a Valsalva maneuver so that any collaterals which might bypass the balloon can be identified. The balloon can then be aspirated and its position adjusted beyond the level of the collaterals before being detached.






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