Fig. 3From: A focal extramedullary hematopoiesis of the spleen in a patient with essential thrombocythemia presenting with a complicated postoperative course: a case reportHistologic examination and immunohistochemistry of the tumor. Histologic examination revealed a 125 × 45 mm poorly marginated tumor (a arrowheads). Outgrowths of granular cells and erythroid cells were observed in the tumor [hematoxylin and eosin stain, × 2 (b), × 20 (c)]. Immunohistochemistry was positive for CD 71 (d), CD 41 (e), myeloperoxidase (f), and hematopoietic cells, including erythroblasts, granulocytes, and megakaryocytes (× 20)Back to article page