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A 10-year-old boy with double collecting system on the right side showing no signal increase in the parenchymal phase and no contrast medium excretion into the collecting system owing to complete ureteral obstruction: (a) region of interest definition, (b) corresponding signal intensity curves. In case of a functionless kidney or kidney pole, the signal curve becomes similar to the curve of other abdominal organ such as the liver with a constant decline of the signal intensity.
