ABSTRACT
Q. 1. a. A DMSA scan always estimates renal function more accurately than a DTPA scan. b. Even if a kidney contributes less than 10% to the total GFR, it’s function will usually improve if the obstruction is relieved. c. Failure of the collecting systems to empty on standing confirms the presence of obstruction. d. Lower urinary tract obstruction may be missed on a DTPA study. e. Giving frusemide during a DTPA study results in a greater specificity for diagnosing PUJ obstruction than giving it at the start of the study.
