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Characteristic primary CNS lymphoma imaging pattern on magnetic resonance imaging. (A) T1 sequence with gadolinium contrast (T1+c) demonstrates a single, frontal, homogenously enhancing brain lesion. (B) Fluid-attenuated inversion recovery (FLAIR) sequence visualizes a comparatively small area of edema surrounding the mass lesion. (C) Diffusion-weighted imaging (DWI) demonstrates restricted diffusion within the tumor.
