Renal Metastases

ByThenappan Chandrasekar, MD, University of California, Davis
Reviewed/Revised Oct 2023
View Patient Education

    Nonrenal cancers may metastasize to the kidneys. The most common cancers that metastasize to the kidney are melanomas and solid tumors, particularly lung, breast, stomach, gynecologic, intestinal, and pancreatic. Leukemia and lymphoma may invade the kidneys, which then appear enlarged, often asymmetrically.

    Despite extensive interstitial involvement, symptoms are rare, and renal function may not change from baseline. Proteinuria is absent or insignificant, and blood urea and creatinine levels rarely increase unless a complication (eg, uric acid nephropathy, hypercalcemia, bacterial infection) occurs.

    Renal metastases are usually discovered during evaluation of the primary tumor or incidentally during abdominal imaging. If there is no known primary tumor, diagnosis and treatment proceed as for renal cell carcinoma.

    Treatment is systemic therapy for the primary tumor and, rarely, surgery. However, partial or radical nephrectomy may be necessary to guide choice of systemic therapy in cases where core needle biopsy is unable to provide sufficient tissue or if renal mass persists in the absence of other metastatic disease.

    quizzes_lightbulb_red
    Test your KnowledgeTake a Quiz!
    Download the free Merck Manual App iOS ANDROID
    Download the free Merck Manual App iOS ANDROID
    Download the free Merck Manual App iOS ANDROID