Perinephric stranding

Perinephric stranding refers to the appearance of edema within the fat of the perirenal space on CT or MRI. While a degree of symmetric bilateral perinephric stranding is common, particularly in the elderly, asymmetric or unilateral perinephric stranding is an important sign of renal inflammation or of acute obstruction. As such, it is seen in conditions such as acute pyelonephritis and with ureteric calculi. Care should be taken to differentiate perinephric stranding from normal perinephric bridging septa.

Article information

rID: 36555
System: Urogenital
Section: Signs
Tag: stub, stub, refs
Synonyms or Alternate Spellings:
  • Perirenal fat stranding (PFS)
  • Perirenal fat stranding
  • Perirenal stranding
  • Perinephric fat stranding

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Cases and figures

  • Case 1a: pyelonephritis on left
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  • Case 1b: pyelonephritis (zoomed in)
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  • Case 1c: pyelonephritis (zoomed in)
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  • Case 2: on left due to ureteric stone
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  • Case 3
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