FDG PET/CT in a Case of Urothelial Carcinoma Arising From a Functional Renal Allograft.

Man, Xiaojun; Dong, Changming; Dong, Aisheng; Song, Xiandong · Clin Nucl Med · 2026

case_report · Level V

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Abstract

Urothelial carcinomas in renal transplant recipients usually occur in the native urinary tract but rarely in the renal allograft. We describe FDG PET/CT and contrast-enhanced CT findings in a case of high-grade urothelial carcinoma arising within the renal allograft with lymph node metastases 9 years after renal transplantation. The primary tumor appeared as an FDG-avid heterogeneously enhancing renal mass with poorly defined margins and preservation of the reniform shape mimicking centrally located infiltrative renal cell carcinoma. Multiple FDG-avid inhomogeneously enhancing ipsilateral internal and external iliac, and retroperitoneal lymph node metastases were observed.