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TDL in a 35-year-old woman. A well-defined lesion is shown in the left basal ganglia, and with predominant hypointensity on T1WI (A), hyperintensity on T2WI (B), and focal peripheral enhancement on contrast-enhanced T1WI (C). Spectrum (D) demonstrates an elevated Cho resonance. The Cho/Cr ratio is not as high as that of PCNSL (1.62). The low Cho/NAA ratio (1.09) strongly supports the diagnosis of TDL. A grade 2 lip-lac peak, caused by the necrosis component, is observed (arrow).
