Cystic Renal Masses: Old and New Paradigms

Area of Science:

• Nephrology
• Urology
• Oncology

Background:

• Cystic renal masses encompass a range of benign and malignant lesions.
• The Bosniak classification system is crucial for assessing the malignant potential of these masses.
• Solid enhancing components in cystic masses often suggest clear cell renal cell carcinoma (ccRCC).

Purpose of the Study:

• To provide a contemporary overview of diagnostic and management strategies for cystic renal masses.
• To discuss historical and emerging clinical paradigms.
• To highlight the role of active surveillance in specific patient populations.

Main Methods:

• Review of current literature on cystic renal mass diagnosis and management.
• Analysis of the Bosniak classification system's utility.
• Evaluation of active surveillance as a management option for selected patients.

Main Results:

• Cystic renal masses are frequently identified incidentally.
• Solid enhancing components in cystic renal masses, while often ccRCC, tend to have an indolent course compared to purely solid masses.
• Active surveillance is increasingly adopted for patients with cystic renal masses who are poor surgical candidates.

Conclusions:

• Cystic renal masses require careful evaluation using tools like the Bosniak classification.
• The indolent nature of some solid-enhancing cystic renal masses supports active surveillance.
• Contemporary management strategies are evolving, emphasizing personalized approaches for these distinct clinical entities.