Abdomen | ct / mri / ultrasound
Renal Mass
Renal mass is a broad imaging term. It may refer to a solid kidney mass, a complex cystic lesion, or another focal abnormality that needs further characterization. The imaging pattern matters much more than the word mass alone.
A renal mass is a focal area in the kidney that looks different from surrounding tissue on imaging.
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What it means
Renal mass is a broad imaging term. It may refer to a solid kidney mass, a complex cystic lesion, or another focal abnormality that needs further characterization. The imaging pattern matters much more than the word mass alone.
Also seen as: kidney mass, renal lesion.
How common it is
Renal masses are less common than simple kidney cysts but are routinely found on abdominal imaging.
Less common than simple renal cysts
Renal masses are a standard abdominal imaging finding that usually prompt more detailed characterization than simple cysts.
Common causes
- Benign renal mass
- Complex cystic lesion
- Solid kidney tumor
- Inflammatory or scar-related focal change
When doctors worry
- The mass enhances or appears solid
- The lesion is large, growing, or indeterminate
- The report recommends dedicated renal protocol imaging or urology follow-up
Typical follow-up
- Use contrast imaging pattern to characterize the lesion
- Review prior scans for stability
- Specialist follow-up may be recommended for solid or indeterminate lesions
Example report wording
Indeterminate enhancing renal mass in the left kidney.
See phrase explanationSolid right renal mass, further urologic evaluation recommended.
See phrase explanation
Common report phrases linked to this finding
Cholelithiasis without evidence of acute cholecystitis.
"Cholelithiasis without evidence of acute cholecystitis." is radiology report language linked to gallstones and is best understood in the context of the full imaging report.
Indeterminate enhancing renal mass in the left kidney.
"Indeterminate enhancing renal mass in the left kidney." is radiology report language linked to renal mass and is best understood in the context of the full imaging report.
Solid right renal mass, further urologic evaluation recommended.
"Solid right renal mass, further urologic evaluation recommended." is radiology report language linked to renal mass and is best understood in the context of the full imaging report.
Frequently asked questions
Does renal mass mean kidney cancer?
Not necessarily. A renal mass is a broad term and some kidney masses are benign.
Why might MRI or multiphase CT be recommended?
These studies can better characterize enhancement and help distinguish cystic from solid lesions.
Related symptom guides
These educational symptom pages explain search-intent questions that often overlap with this finding.
Clear medical disclaimer
Educational information only. Always consult your clinician for medical advice.
This page is educational only and should be used to understand report language, not to diagnose a condition or replace clinician review.
Sources
Sources and medical review process
RadDx finding pages are written for patient education using consumer-friendly radiology references, plain-language terminology resources, and cautious summary review of common imaging follow-up frameworks.
- Reviewed by
- RadDx Editorial Team
- Last reviewed
- March 10, 2026
- RadiologyInfo.org
RSNA and ACR
- MedlinePlus
U.S. National Library of Medicine
- NCI Dictionary of Cancer Terms
National Cancer Institute
Sources are used for patient education context and terminology support. They do not replace clinician review of your individual report.
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