Whitfield H N, Britton K E, Hendry W F, Wickham J E
Br J Urol. 1979 Dec;51(6):445-8. doi: 10.1111/j.1464-410x.1979.tb03575.x.
Standard intravenous urography is not a reliable method of demonstrating pelviureteric junction obstruction. Frusemide urography enables 3 groups to be defined on the basis of the percentage increase in the size of the renal pelvis after the diuretic. These groups are clinically significant.