Perirenal cobweb

Perirenal cobwebs is the presence of prominent perinephric septae. 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 uretral obstruction due to stone. It may also be seen in other situations such as 

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Article information

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

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Cases and figures

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    Case 2 - transitional cell carcinoma of the renal pelvis
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