Watchful waiting for small renal masses.

Area of Science:

• Urology
• Oncology
• Radiology

Background:

• Small renal masses (SRMs), defined as renal tumors < 4 cm, represent the majority of treated renal tumors.
• Incidental detection via abdominal imaging leads to earlier diagnosis of renal cell carcinoma and benign renal tumors, often with favorable characteristics.
• SRMs typically exhibit indolent behavior and an excellent prognosis.

Purpose of the Study:

• To evaluate the role of active surveillance in managing small renal masses.
• To identify patient populations who are suitable candidates for active surveillance.
• To emphasize the importance of histopathologic characterization before treatment.

Main Methods:

• Review of current management strategies for small renal masses.
• Analysis of patient characteristics, including age and comorbidities, in relation to active surveillance suitability.
• Consideration of diagnostic techniques for histopathologic characterization.

Main Results:

• Active surveillance is a suitable option for older patients and those with significant medical comorbidities due to their low risk of early progression.
• Younger, healthier patients are not ideal candidates for active surveillance until better prognostic factors are established.
• Minimally invasive surgical and ablative therapies are increasingly used, but active surveillance remains an option for selected cases.

Conclusions:

• Active surveillance is appropriate for select patients with small renal masses, particularly older individuals with comorbidities.
• Further research is required to establish clear prognostic factors for younger, healthier patients before recommending active surveillance.
• Histopathologic characterization through needle core biopsy should be considered to guide treatment decisions for SRMs.