Benign peripelvic extravasation associated with renal colic.

Extravasation of opaque material may be a totally unexpected finding during the course of intravenous urography in patients examined during or shortly after an episode of renal colic. We have recently observed this phenomenon in five patients in whom typical renal colic occurred six to twenty hours prior to urographic studies. Hematuria, gross or microscopic, was observed in all. Opaque renal calculi were demonstrated in two instances and nonopaque calculi were presumed to be present in the others. Surgical intervention was required in one case. No instrumentation had been performed prior to the intravenous examinations. Except for minimal temperature elevation within twenty-four hours of the onset of colic, no other symptoms or signs occurred that could be related to the presence of extravasated urine. All patients recovered without incident and were asymptomatic upon discharge. The duration of extravasation appeared to be related to the duration of renal colic, since, after relief of colic, repeat intra...