A 64-year-old male smoker with hypertension presents with microscopic hematuria detected on routine urinalysis. Ultrasound of the abdomen reveals a 5.5 cm heterogeneous hyperechoic solid mass arising from the upper pole of the right kidney, with internal vascularity on color Doppler. An adjacent simple anechoic cyst with smooth walls is also noted. Contrast-enhanced triphasic CT confirms the mass shown as **A** in the diagram, demonstrating heterogeneous enhancement of 18 Hounsfield units above baseline, without renal vein involvement, regional lymphadenopathy, or distant metastases. Based on the imaging characteristics of the mass marked **A**, what is the most appropriate management strategy for this patient?
A. Partial nephrectomy (nephron-sparing surgery) via laparoscopic approach
B. Radical nephrectomy with ipsilateral adrenalectomy
C. Active surveillance with serial imaging every 3 months
D. Percutaneous radiofrequency ablation under ultrasound guidance
Explanation
Why Partial nephrectomy (nephron-sparing surgery) via laparoscopic approach is right
The mass marked A is a 5.5 cm (T1b) heterogeneously enhancing solid renal mass with enhancement >15 Hounsfield units, confirming true neoplasm rather than hyperdense cyst. According to AUA/EAU RCC Guidelines 2024, partial nephrectomy is the preferred nephron-sparing approach for T1 tumors whenever technically feasible, offering equivalent oncologic outcomes while preserving renal function and reducing long-term cardiovascular and chronic kidney disease morbidity. The laparoscopic or robotic approach is preferred over open surgery. This patient has no contraindications to nephron-sparing surgery (no renal vein thrombus, no IVC involvement, no evidence of advanced disease).
Why each distractor is wrong
Radical nephrectomy with ipsilateral adrenalectomy: While radical nephrectomy is reserved for large/central tumors, T2/T3 disease, or when partial nephrectomy is not feasible, this patient's 5.5 cm upper-pole mass is amenable to partial nephrectomy. Routine ipsilateral adrenalectomy is not indicated unless there is direct adrenal invasion (T4), which is absent here. Radical nephrectomy unnecessarily sacrifices renal parenchyma.
Active surveillance with serial imaging every 3 months: Active surveillance is considered only for small renal masses ≤3 cm (T1a) in elderly or heavily comorbid patients with limited life expectancy. This patient is 64 years old with a 5.5 cm mass (T1b) and no mention of prohibitive comorbidities; he is a surgical candidate and requires definitive treatment.
Percutaneous radiofrequency ablation under ultrasound guidance: Thermal ablation (cryoablation, radiofrequency) is reserved for small tumors in poor surgical candidates or those with significant perioperative risk. This patient is a reasonable surgical candidate without documented contraindications, making nephron-sparing surgery the preferred approach over ablation.
High-YieldNEET PG
For T1 RCC, partial nephrectomy is preferred over radical nephrectomy whenever technically feasible—it preserves renal function and has equivalent oncologic outcomes.
AUA/EAU RCC Guidelines 2024; WHO Urinary 5e
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