Nucl Med Mol Imaging.  2011 Dec;45(4):308-313.

Incidental Bilateral Renal Oncocytoma in a Patient with Metastatic Carcinoma of Unknown Primary: a Pitfall on 18F-FDG PET/CT

  • 1Department of Nuclear Medicine, Brandon Regional Health Centre, 150 McTavish Ave E, Brandon, MB R7A 2B3, Canada.
  • 2Department of Nuclear Medicine, Royal Victoria Hospital, McGill University Health Centre, 687 Pine Ave West, Floor M2, Montreal, Quebec H3A 1A1, Canada.


Bilateral renal masses are uncommon but can raise a strong suspicion of primary or secondary malignancy, especially during the initial work-up of an oncology patient. Renal oncocytomas are benign renal tumors that are commonly discovered incidentally on diagnostic imaging with a small percentage occurring bilaterally. Although 18F-FDG uptake in renal oncocytomas has been described, a case of a bilateral 18F-FDG-avid renal oncocytoma has not been previously reported in the literature. A variety of malignant causes of bilateral 18F-FDG positive renal masses are known, however it is important to include this benign etiology in the differential diagnosis. We report an unusual case of an incidental bilateral renal oncocytoma evaluated with contrast enhanced CT and 18F-FDG PET/CT.


Bilateral renal oncocytoma; Bilateral renal mass; FDG; PET/CT

MeSH Terms

Adenoma, Oxyphilic
Diagnosis, Differential
Diagnostic Imaging
Fluorodeoxyglucose F18
Kidney Neoplasms
Adenoma, Oxyphilic
Fluorodeoxyglucose F18
Kidney Neoplasms
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