How to characterise a solid renal mass: a new classification proposal for a simplified approach

Area of Science:

• Radiology
• Medical Imaging
• Oncology

Background:

• Computed tomography (CT) is the primary method for characterizing solid renal masses.
• Magnetic resonance imaging (MRI) and ultrasound offer complementary information for masses with indeterminate cystic or solid nature on CT.
• Differentiating renal masses is crucial for appropriate patient management and treatment strategies.

Purpose of the Study:

• To evaluate the utility of CT and MRI in characterizing solid renal masses.
• To propose a classification system for solid renal masses based on imaging features.
• To establish imaging criteria for differentiating benign from potentially malignant renal lesions.

Main Methods:

• Review of CT and MRI scans for solid renal masses.
• Application of a proposed four-type classification system based on CT findings.
• Correlation of imaging features with pathological diagnosis where available.

Main Results:

• CT is the reference standard for solid renal mass characterization.
• MRI can substitute CT for characterizing solid renal masses in most instances.
• A proposed CT-based classification categorizes masses into: pseudotumoral dysmorphisms (type 1), high-fat angiomyolipomas (type 2), indeterminate tumors (type 3), and malignant tumors (type 4).

Conclusions:

• CT is effective for classifying solid and vascular renal masses.
• MRI serves as a valuable alternative to CT for solid mass characterization.
• The proposed CT classification aids in differentiating benign from potentially malignant renal masses.