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Avulsion of the pelvi-ureteric junction--a rare consequence of non-penetrating trauma.

Abstract Rupture of the ureter due to non-penetrating trauma is a rare injury. Early diagnosis is important because elective anastomosis appears to offer the best results. A tetrad of radiological signs is suggested as being virtually diagnostic of this injury and consists of good excretion of contrast medium, intact calyceal outline, extravasation in the region of the pelvi-ureteric junction and non-filling of the affected ureter.