Junctional parenchymal defect of kidney

Junctional parenchymal defects in renal imaging are a normal variant, which results from the incomplete embryonic fusion of renunculi.

Radiographic features


It can be seen as a triangular echogenic cortical defect, frequently seen in upper lobe parenchyma. The defect is the extension of sinus fat into the cortex, usually at the border of the upper pole and interpolar region of the kidney. 

Differential diagnosis

General imaging considerations include:

Anatomy: Abdominopelvic

Anatomy: Abdominopelvic

Article information

rID: 16286
System: Urogenital
Section: Anatomy
Synonyms or Alternate Spellings:
  • Junctional cleft of kidney
  • Renal junctional parenchymal defect
  • Renal junctional parenchymal defects
  • Junctional parenchymal defect of kidneys
  • Junctional parenchymal defect of the kidney

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Cases and figures

  • Extension of sinu...
    Case 1
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  • Case 2
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