Pediatric Renal Neoplasms:: MR Imaging-Based Practical Diagnostic Approach

Area of Science:

• Pediatric Radiology
• Oncology
• Medical Imaging

Background:

• Pediatric renal tumors encompass a range of malignant and benign neoplasms.
• Wilms tumor is the most common malignant pediatric renal tumor.
• Other malignant tumors include renal cell carcinoma, clear cell sarcoma, and rhabdoid tumors, varying in age of presentation and aggressiveness.

Purpose of the Study:

• To review current magnetic resonance (MR) techniques for evaluating pediatric renal neoplasms.
• To describe the common MR imaging characteristics of both malignant and benign pediatric renal tumors.
• To highlight how MR findings, combined with clinical data, can narrow the differential diagnosis.

Main Methods:

• Review of current MR imaging techniques applicable to pediatric renal masses.
• Analysis of characteristic MR imaging features for common pediatric renal tumors.
• Correlation of imaging findings with clinical data for diagnostic refinement.

Main Results:

• While imaging appearances can overlap, specific MR characteristics aid in differentiating tumor types.
• Malignant tumors like Wilms tumor, renal cell carcinoma, clear cell sarcoma, and rhabdoid tumors have distinct, though sometimes overlapping, MR signatures.
• Benign tumors such as mesoblastic nephroma, multilocular cystic renal tumor, angiomyolipoma, and metanephric adenoma also possess characteristic MR findings.
• Secondary renal involvement by lymphoma and leukemia can be identified.

Conclusions:

• Magnetic resonance (MR) imaging is a crucial tool in the diagnosis of pediatric renal tumors.
• Detailed analysis of MR characteristics and clinical information is essential for accurate differential diagnosis.
• MR imaging significantly improves the ability to distinguish between various malignant and benign pediatric renal neoplasms, guiding further management.