Extrarenal pelvis

Dr Dan J Bell and Dr Aditya Shetty et al.

Extrarenal pelvis refers to the presence of the renal pelvis outside the confines of the renal hilum; it is a normal anatomic variant.

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.

CT/MRI

  • 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 whether a dilated renal pelvis is obstructed or not, renal scintigraphy can clarify

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Article information

rID: 27487
System: Urogenital
Section: Anatomy
Synonyms or Alternate Spellings:
  • Extrarenal renal pelvis

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