Workshops This Weekend! Join Frank Gaillard, Miranda Siemienowicz and Andrew Dixon at RANZCR 2021 Virtual - free for All-Access Pass holders FIND OUT MORE

Extrarenal pelvis

Last revised by Dr Matt Adams on 24 Apr 2021

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.

  • 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

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Case 1
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.