Original Article
18F-FDG PET/CT Evaluation of Lymphoma with Renal Involvement: Comparison with Renal Carcinoma
Abstract
Objective: Lymphoma can arise at any anatomic site, but it is rare to find kidney involvement. The aim of this study was to assess the role of 18F-flourodeoxyglucose (18F-FDG) positron emission tomography (PET)/computed tomography (CT) in detecting lymphoma with renal involvement. Reports of such use of 18F-FDG PET/CT are limited.
Methods: Twelve lymphoma patients with renal involvement and 12 renal carcinoma patients were studied with 18F-FDG PET/CT. Intense 18F-FDG uptake, suggestive of positivity, was measured in mean standardized uptake values (standardized uptake values [SUV] mean).
Results: The results of PET/CT were validated by bone marrow, biopsy tissue and/or surgery.18F-FDG PET/CT detected lymphoma with renal involvement lesions or renal carcinoma lesions in at least one site in the 24 patients. 18F-FDG uptake by the lymphoma lesions was much higher than the 18F-FDG uptake by the renal clear cell carcinomas (SUV mean 6.37 ± 2.28 vs 2.58 ± 0.62), and similar to that of renal cell carcinoma and renal collecting duct carcinoma (SUV mean 6.37 ± 2.28 vs 6.27 ± 1.15). There were dissimilar morphological changes in the homologous CT. Differing from renal cancer, lymphoma in the spleen, uterus, and bone marrow can easily be diagnosed by 18F-FDG PET/CT.
Conclusion: The lesions of lymphoma with renal involvement, and especially those of primary renal lymphoma, are 18F-FDG avid. PET/CT appears to be useful in comparing these lesions with those of renal carcinoma, especially for primary renal lymphoma.
Key Points
* The present study demonstrated that 18F-FDG PET/CT is a useful tool for diagnosing lymphoma with renal involvement.
* 18F-FDG uptake of the lesions in lymphoma was much higher than the 18F-FDG uptake focusing on renal clear cell carcinoma (SUV mean 6.37 ± 2.28 vs 2.58 ± 0.62).
* 18F-FDG uptake of lymphoma lesions were similar to that of renal cell carcinoma and renal collecting duct carcinoma (SUV mean 6.37 ± 2.28 vs 6.27 ± 1.15), but there were dissimilar morphological changes in the homologous computed tomography scan.
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