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Dual-Tracer PET/CT Differentiates 2 Types of Primary Cancers and Metastases in a Patient With Crossed Fused Renal Ectopia

Ho, Chi-lai, MD*; Chen, Sirong, PhD*†; Leung, Yim Lung, MBBS*; Cheng, Kam Chau, MBBS*; Wong, Yuet Hung, MBBS*

doi: 10.1097/RLU.0000000000002390
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A patient was found incidentally on dual-tracer (11C-acetate [ACT] and 18F-FDG [FDG]) PET/CT for having crossed fused renal ectopia and 2 types of malignant tumors, colonic carcinoma and renal cell carcinoma (RCC), each having its own characteristic tracer avidity. Multiple liver metastases were also mutually exclusive, with a purely ACT-avid group of metastatic lesions from RCC and another FDG-avid group from colonic carcinoma. Bone and lung metastases, however, could not be readily distinguishable in terms of primary origins. Crossed fused renal ectopia is a rare anomaly, even rarer to have RCC coexisting with a second primary malignancy.

From the *Department of Nuclear Medicine & PET and

Medical Physics & Research Department, Hong Kong Sanatorium & Hospital, Hong Kong, China.

Received for publication August 31, 2018; revision accepted October 11, 2018.

Conflicts of interest and sources of funding: none declared.

Correspondence to: Chi-lai Ho, MD, Department of Nuclear Medicine & PET; Hong Kong Sanatorium & Hospital, 2 Village Road, Happy Valley, Hong Kong, China. E-mail: garrettho@hksh.com.

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