Peripelvic Extravasation

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Abstract
A report is presented on a patient in whom the intravenous urogram, obtained during an acute attack of renal colic due to an ureteral stone, disclosed peripelvic extravasation. Similar reports in the literature are relatively rare. It might be that such extravasation in acute obstruction can be more frequently observed when intravenous urography is done during the acute phase of the obstruction. This is suggested also by the observation of a slight degree of pericalyceal extravasation during compression in intravenous urography. This extravasation arises from small ruptures in the fornices and from this point continues via several possible pathways, viz.: the pyelolymphatic, pyelovenous, pyelointerstitial as well as the pericalyceal and peripelvic.

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