A Rare Presentation of Isolated CNS Posttransplantation Lymphoproliferative Disorder

Figure 4

Immunohistochemistry/CD20 stain of brain biopsy (day 50). CD20+ perivascular B-cell infiltrates. Many also are staining positive for EBV-encoded RNA (EBER), which is not depicted but indicates presence of Epstein-Barr Virus. Additional stains of the sample suggested increased presence of polymorphic plasmacytes and T-cells.