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Male, 47 years of age, 1-month history of mental abnormalities. The arrow points to the typical magnetic resonance imaging (MRI) features of primary central nervous system lymphoma (PCNSL). a T1-weighted imaging. b T2-weighted. c Fluid attenuation inversion recovery (FLAIR). d Diffusion-weighted imaging (DWI). e Significant enhancement of the lesion on Gd-DTPA MRI with a typical “belly button” sign
