Figure 2

Microphotographs of the monomorphic PTLD. A. Large lymphoid cells with abundant cytoplasm, vesicular nuclei and prominent nucleoli (H&E, 400× magnification); B. Neoplastic cells positive for CD20 (immunoperoxidase stain, 400× magnification); C. Neoplastic cells positive for EBV LMP (immunoperoxidase stain, 400× magnification).