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Abdominal Mass Biopsy. A, Sheets of Atypical Plasma Cells, Hematoxylin and Eosin 20×. B, CD138 Immunostain Confirming that the Mass Is Composed of Plasma Cells. CD138 Immunohistochemistry, 10×. C, Epstein-Barr Encoding Region (EBER) Chromogenic in Situ Hybridization (CISH) 10×. Small Encoded RNA (EBER) by CISH Shows the Presence of Epstein Barr Virus (EBV), in This EBV-driven Monomorphic Plasmacytic Post-transplant Lymphoproliferative Disorder
