Citation, DOI, disclosures and article data
Citation:
Wani R, Knipe H, Renal halo sign. Reference article, Radiopaedia.org (Accessed on 14 Dec 2024) https://doi.org/10.53347/rID-180844
Disclosures:
At the time the article was last revised Henry Knipe had the following disclosures:
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to
not be relevant to the changes that were made.
View Henry Knipe's current disclosures
The renal halo sign has been described in both acute pancreatitis 1,2 and in renal tumors post radiofrequency ablation 3.
Radiographic features
Plain radiograph
On abdominal x-rays, the lateral margin of the kidney becomes visible due to differential x-ray absorption of perirenal fat and pancreatitis inflammatory exudate. The lateral margins of the kidneys are usually not visible 1.
CT/MRI
Post radiofrequency ablation, the renal halo sign has been described as macroscopic fat surrounding >50% of the ablated renal tumor, which in turn is surrounded a thin curvilinear soft tissue density 2.
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1. Susman N, Hammerman A, Cohen E. The Renal Halo Sign in Pancreatitis. Radiology. 1982;142(2):323-7. doi:10.1148/radiology.142.2.7054821 - Pubmed
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2. Schirmang T, Mayo-Smith W, Dupuy D, Beland M, Grand D. Kidney Neoplasms: Renal Halo Sign After Percutaneous Radiofrequency Ablation—Incidence and Clinical Importance in 101 Consecutive Patients. Radiology. 2009;253(1):263-9. doi:10.1148/radiol.2531082257 - Pubmed
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