Perirenal cobweb

Perirenal cobwebs are the presence of prominent perinephric septa. It is best appreciated on CT images.


The cobweb is considered to be due to engorged venous collaterals or due to edema and fluid extravasation into the perirenal space 1.

Perirenal cobwebs may be seen in many benign and malignant conditions of the kidney. The commonest cause is acute ureteral obstruction due to a stone. It may also be seen in other situations such as 

Article information

rID: 25504
System: Urogenital
Section: Signs
Synonyms or Alternate Spellings:
  • Perirenal cobwebs
  • Peri-renal cobweb
  • Perirenal cob web

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Case 2 - transitional cell carcinoma of the renal pelvis
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.