Junctional parenchymal defect of kidney

Junctional parenchymal defects in renal imaging are a normal variant.

It results from the incomplete embryonic fusion of renunculi.

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. 

General imaging considerations include:

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Article information

rID: 16286
System: Urogenital
Section: Anatomy
Synonyms or Alternate Spellings:
  • 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: on CT
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