Abstract
Spontaneous pyelosinus extravasation (SPE) occurs rarely. It is observed on intravenous urograms performed for the evaluation of “obstructive” processes. SPE is hypothesized to be caused by an acute or subacute increase in renal pelvic pressure secondary to a urinary calculus or other processes that leads to a sudden increase in hydrostatic pressure. Only two cases of SPE secondary to blunt abdominal trauma have been described. We report three additional cases, all of which demonstrated pyelosinus extravasation on their initial intravenous urograms. All patients were followed conservatively without surgical intervention, and each had a benign course without complication. Herein, we present the radiographic findings, pathophysiologic mechanisms, and treatment implications of SPE with the emphasis on expectant management.
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