Perinephric stranding

Last revised by Dr Yuranga Weerakkody on 27 Aug 2021

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. Some papers have also suggested an associated with bladder outlet obstruction 3.

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

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