Plasma cell and T-cell lymphomas.

(A) Plasmacytoma. Well-differentiated neoplasm with progression from large plasmablasts with prominent central nucleoli to mature plasma cells (H&E, × 750). (B) Plasmacytoma. Moderately differentiated with maturation of plasmablasts into plasma cells (H&E, × 750). (C) Anaplastic plasmacytoma. Large blast cells with plentiful amphophilic cytoplasm (H&E, × 750). (D) Precursor T-cell lymphoblastic lymphoma. Uniform population of medium-sized cells with central or small scattered nucleoli (H&E, × 1000). (E) T-natural killer cell leukemia. Mature small lymphocytes and some large immature lymphoblasts (H&E, × 750). (F) Large cell anaplastic T-cell lymphoma. Comprising mainly large anaplastic immunoblastlike cells with large nucleoli (H&E, × 750).