Fig 2. A–F, Magnetic resonance imaging (MRI) of bilateral renal masses in a patient with Rosai–Dorfman disease. (A) Masses (thin arrows ) have hypo to isointense signal on transverse T1 weighted image and (B) appear as mild heterogeneous hyperintense masses on transverse T2-weighted image (C) Masses have moderate enhancement on transverse gadoxetic acid-enhanced nephrogenic phase image and (D) sustain enhancement in the delayed phase. (E) Mild hyperintense masses on diffusion-weighted imaging obtained with a b-value of 800 s/mm2 and (F) hypointense masses on apparent diffusion coefficient map.