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Guideline Current ACR 2018

ACR Incidental Renal Mass

ACR white paper for incidental renal masses detected on non-dedicated imaging. Applies to solid and indeterminate cystic masses; Bosniak 2019 is used for cystic lesions.

Updated Jul 5, 2026
Applies to
  • Incidentally detected renal masses on CT or MRI
Classification
  • Feature group Benign
  • Feature group Too small to characterize
  • Feature group Indeterminate
  • Feature group Suspicious
Exclusions
  • Known renal cell carcinoma
  • Dedicated renal mass protocol
Interactive

Decision tree

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Recommendation builder

Select the category of the incidental renal mass. Use Bosniak 2019 for cystic lesions.

FAQ

Frequently asked

Does this guideline apply to oncology patients?

No — patients with known malignancy fall outside the scope unless the guideline states otherwise. Follow oncologic surveillance protocols instead.