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. 2022 Dec 29;482(1):53–68. doi: 10.1007/s00428-022-03480-8

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Fig. 1 — Essential Thrombocythemia is characterized by a normocellular marrow with increased number of megakaryocytes forming loose clusters and rarely dense clusters, with large to giant elements and hyperlobulated nuclei. Erythropoietic and granulopoietic series do not show significant abnormalities. Reticulin fibrosis is usually not increased (MF-0)