Renal Cell Carcinoma Diagnosis After Initial Detection on Screening Mammogram

Area of Science:

• Oncology
• Nephrology
• Radiology

Background:

• Renal cell carcinoma (RCC) is a diverse group of kidney cancers originating in the renal cortex.
• RCC often presents asymptomatically, frequently diagnosed at advanced or metastatic stages.
• Metastasis commonly occurs to distant sites, with diagnosis often incidental or symptomatic.

Observation:

• A 57-year-old woman with a history of resected RCC presented with a posterior breast mass.
• Diagnostic workup included mammogram, ultrasound, and core biopsy.
• The breast mass was confirmed as metastatic recurrence of RCC.

Findings:

• The breast is an uncommon site for renal cell carcinoma metastasis.
• This case highlights the importance of considering metastatic RCC in patients with a history of the disease and a new breast mass.
• Diagnostic imaging and biopsy confirmed the metastatic origin.

Implications:

• Healthcare providers should maintain a high index of suspicion for metastatic RCC in the breast, even if rare.
• Early recognition of unusual metastatic sites can lead to timely and appropriate patient management.
• This case underscores the need for comprehensive evaluation in patients with a history of RCC presenting with new focal lesions.