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British Journal of Radiology (2006) 79, e50-e52
© 2006 British Institute of Radiology
doi: 10.1259/bjr/38262574
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Upper pole of a duplex kidney mimicking adrenal incidentaloma in 18F-fluoro-2-deoxy-D-glucose positron emission tomography: a pitfall in diagnosis

S-C Chan, MD 1 T-C Yen, MD, PhD 1 and K-K Ng, MD 2

Departments of 1Nuclear Medicine and 2Diagnostic Radiology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan


Figure 1
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  		Figure 1. (a) FDG-PET scan revealed a large FDG avid lesion in the right suprarenal area (arrow). (b) A delayed-phase scan performed 2 h later after injection of the diuretic showed unchanged suprarenal lesion whilst the activity over lower half of right kidney has markedly reduced; thus, an adrenal incidentaloma was presumed.

 

Figure 2
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  		Figure 2. CT urography showed a right partial duplex kidney with a small upper pole. Interruption of the upper pole ureter could be due to peristalsis or obstruction(arrow).

 

Figure 3
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  		Figure 3. Fusion of the CT and FDG-PET images at the same level showed the right "adrenal" lesion in PET corresponded to the upper pole of the right duplex kidney in CT (arrow).

 




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