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Difficulty: HardUrologic Surgery

A 5252-year-old man comes to the urology clinic to discuss the results of recent imaging. Two weeks ago, he presented to the emergency department with mild left lower quadrant abdominal discomfort. A CT scan of the abdomen and pelvis with contrast was performed to evaluate for diverticulitis; the colon appeared normal, but an incidental 3.43.4-cm solid, heterogeneously enhancing, exophytic mass was discovered in the lower pole of the left kidney. He has a history of well-controlled hypertension and hyperlipidemia. His BMI is 2828 kg/m 2^2. Vital signs are within normal limits. Physical examination reveals a soft, non-tender abdomen without palpable masses. Serum creatinine is 0.90.9 mg/dL, and urinalysis shows no abnormalities. There is no evidence of lymphadenopathy or vascular involvement on the imaging. Which of the following is the most appropriate next step in management?

  1. A
    CT-guided core needle biopsy
  2. B
    Radical nephrectomy
  3. Partial nephrectomyAnswer
  4. D
    Active surveillance with repeat imaging
  5. E
    Empiric broad-spectrum antibiotic therapy

Answer

Partial nephrectomy
The correct answer is partial nephrectomy. This patient has an incidental solid, heterogeneously enhancing renal mass. On contrast-enhanced CT, this presentation is highly suspicious for renal cell carcinoma (RCC). The management of suspected RCC depends primarily on tumor size, location, and the patient's surgical risk. This mass is 3.43.4 cm in diameter, classifying it as a clinical T1a tumor (defined as ≤4\leq 4 cm and confined to the kidney). Furthermore, it is exophytic (growing outward from the surface), making it anatomically accessible. For young, healthy patients with T1a renal masses, partial nephrectomy (nephron-sparing surgery) is the gold standard treatment. It offers oncologic outcomes equivalent to radical nephrectomy while preserving maximum functional renal parenchyma, thereby significantly reducing the patient's lifetime risk of developing chronic kidney disease.

Step-by-Step Solution

1
Analyze the patient's incidental imaging finding.
The finding is a 3.43.4-cm, solid, heterogeneously enhancing, exophytic renal mass in a healthy patient.
Identifying the characteristics of the mass is crucial for diagnosis, as solid, enhancing renal masses on CT are highly suspicious for renal cell carcinoma (RCC).
2
Determine the clinical stage and need for tissue diagnosis.
The mass is highly suspicious for RCC and does not require a prior biopsy. It is <4< 4 cm and confined to the kidney, classifying it as a clinical T1a lesion.
Unlike many other solid tumors, the standard of care for highly suspicious renal masses is direct surgical excision, which is both diagnostic and therapeutic.
3
Select the most appropriate definitive management based on tumor stage and patient factors.
Partial nephrectomy is indicated.
For T1a renal masses that are surgically accessible (exophytic), nephron-sparing surgery (partial nephrectomy) is the standard of care to preserve renal function while providing excellent oncologic control.

Key Concept

The standard of care for a clinical Stage T1a (<4<4 cm) solid, enhancing renal mass in a healthy patient is nephron-sparing surgery (partial nephrectomy) without the need for a prior percutaneous biopsy.
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Topics

Urologic Surgery

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