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It is found in ~10% of the population 2.
An extrarenal pelvis usually appears dilated, erroneously suggesting obstructive pathology. Subsequent investigation with CT usually clarifies a false interpretation on ultrasound.
- a normal extrarenal pelvis will demonstrate normal renal cortical thickness, bilateral symmetrical contrast excretion, and normal-appearing calyces 3
After evaluation with ultrasound and/or CT/MRI, if there is still confusion about whether a dilated renal pelvis is obstructed or not, renal scintigraphy can clarify
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