Renal cell carcinoma: unusual systemic manifestations

Area of Science:

• Oncology
• Nephrology
• Radiology

Background:

• Renal cell carcinoma (RCC) diagnosis can be challenging due to atypical presentations.
• The classic triad of flank pain, gross hematuria, and palpable mass is infrequently observed in patients with RCC.

Observation:

• In this case series, the classic triad was absent in all patients diagnosed with RCC.
• Initial clinical suspicion for RCC was low in most patients, with diagnoses like polycystic kidney disease or cardiac failure obscuring the primary cancer.
• Tumor presence ranged from 3 to 12 years before detection in some cases, highlighting diagnostic delays.

Findings:

• Recognizing hematologic, humoral, immunologic, and vascular abnormalities induced by RCC is crucial for early diagnosis.
• Systematic application of advanced imaging modalities (excretion urography, nephrotomography, ultrasonography, renal scanning, arteriography, cyst puncture) can achieve near 100% diagnostic accuracy.
• Radical nephrectomy is the primary treatment; partial nephrectomy is an option for solitary kidneys. Metastatectomy may be feasible.

Implications:

• Delayed diagnosis of renal cell carcinoma is common, necessitating a broader diagnostic approach beyond classic symptoms.
• Advanced imaging and awareness of tumor-induced systemic effects are key to improving early detection rates.
• While surgery is primary, management of advanced or metastatic disease requires consideration of dialysis and transplantation, with limited roles for hormonal, chemotherapeutic, or radiation therapies.