Extrarenal pelvis

Extrarenal pelvis refers to the presence of the renal pelvis outside the confines of the renal hilum. It is a normal variant that is found in ~10% of the population 2

The renal pelvis is formed by all the major calyces. An extarenal pelvis usually appears dilated giving a false indication of an obstructive pathology. Subsequent investigation with CT, usually clarifies the false interpretation on ultrasound.

Radiographic features

  • a normal extrarenal pelvis will demonstrate normal renal cortical thickness, bilateral symmetrical contrast excretion and normal appearing calyces 3

Differenital diagnosis

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Article information

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

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