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. 2014 Feb;35(2):270–277. doi: 10.3174/ajnr.A3677

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© 2014 by American Journal of Neuroradiology

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Fig 3. — Atypical PCNSL in a 59-year-old man. Multiple lesions are observed in left parieto-occipital periventricular white matter, genu, and splenium of the corpus callosum, with hyperintensity on T2WI (A), isointensity on T1WI (B), and patchy infiltrative enhancement on contrast-enhanced T1WI (C). D, The Cho/Cr ratio and the Cho/NAA ratio are 4.55 and 8.46, respectively. Both obvious elevation of the Cho peak and reduction of the NAA peak strongly suggest tumor rather than TDL. A high lip-lac peak (grade 4) is observed in this case (arrow).