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Aplastic anemia in an 8-year-old boy with pancytopenia. He had severely hypoplastic bone marrow with replacement of fat cells (A). Lymphocytes and plasma cells were scattered. Megakaryocytes and granulocytes were not present (B). CD8-positve cytotoxic T cells were increased (C). H&E staining. (A) ×40; (B) ×400. Immunohistochemistry. (C) ×400.
