Technetium-99m-L,L-Ethylenedicysteine Is More Effective Than Technetium-99m Diethylenetriamine Penta-acetic Acid for Excluding Obstruction in Patients With Pyelocalicinal Dilation

99mTc-EC was more effective than 99mTc-DTPA for excluding obstruction, presenting less false-positive and indeterminate results. 99mTc-EC can substitute 99mTc-DTPA to evaluate patients with urinary tract dilation.