Solid masses arising in transplanted kidneys.

Area of Science:

• Nephrology
• Radiology
• Transplant Surgery

Background:

• Renal transplantation significantly improves survival and quality of life for end-stage renal failure patients.
• Post-transplant monitoring commonly utilizes imaging, primarily sonography, to assess the renal allograft.
• Solid masses within or adjacent to the renal allograft are uncommon but require careful evaluation.

Purpose of the Study:

• To review the diverse causes of solid masses occurring in renal allografts.
• To describe the characteristic imaging findings associated with these masses.
• To provide a guide for radiologists and clinicians managing renal transplant recipients with allograft masses.

Main Methods:

• Review of existing literature on renal allograft masses.
• Analysis of imaging characteristics (sonography, CT, MRI) of various solid masses.
• Correlation of imaging findings with pathological diagnoses.

Main Results:

• Solid masses in renal allografts can originate from various sources, including native kidney remnants, lymphoproliferative disorders, infections, and de novo tumors.
• Imaging findings differ based on the mass etiology, with specific features on ultrasound, CT, and MRI aiding differentiation.
• Early and accurate diagnosis is crucial for appropriate management and patient outcomes.

Conclusions:

• Solid masses in renal allografts, though uncommon, represent a spectrum of pathologies.
• Multimodality imaging plays a critical role in characterizing these masses.
• Understanding the imaging findings is essential for timely diagnosis and management in renal transplant patients.