60 year old male presents with hypertension, hyperglycemia, and hypokalemia.   In the coarse of the workup a FDG PET/CT was performed.   From the images provided ((a) FDG PET MIP (Maximal Intensity projection), (b) axial FDG PET, (c) contrast enhanced axial CT, and (d) co registered FDG PET/CT), what is the most likely diagnosis?