Figure 1: (a) FDG-PET image showing a large metabolic active tumor centrally located in the left upper lobe, with FDG avid lymph nodes at level 8, 4L and 2R. (b) No clear abnormalities on left knee X-ray. (c) MRI STIR image showing pathological signal intensity in the lateral condyl of the left femur fitting with bone metastasis.