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Figure 2: (a) Brain biopsy showing perivascular lymphoma cells, (b) which are T-cell positive, (c) B-cell negative, and (d) focally high Ki-67 labeling

Figure 2: (a) Brain biopsy showing perivascular lymphoma cells, (b) which are T-cell positive, (c) B-cell negative, and (d) focally high Ki-67 labeling