Fig. 1

Abdominal contrast-enhanced CT and 18F-FDG PET-CT. A solid, circumscribed, low-density, cortical lesion (15 mm x13 mm) in the posterior lip of the left kidney, which appears to be moderately enhanced. There was no obvious enhancement in the arterial phase, but it was progressive in the venous phase and delayed phase. B mild FDG uptake in the mass