Fig 3. A and B, Follow- up axial FDG PET/CT scan images of right renal mass and mediastinal lymph nodes in a patient with renal Rosai–Dorfman disease. (A) The tumor in the right renal pelvicalyceal system (arrow) shows increased uptake (SUVmax: 13.3) as well as (B) few renal cortical foci (arrow) with mild uptake (SUVmax: 6.3).