What is the role of dysplastic WBC changes in the diagnosis of myelodysplastic syndrome (MDS)?

Updated: Jul 24, 2018
  • Author: Emmanuel C Besa, MD; Chief Editor: Koyamangalath Krishnan, MD, FRCP, FACP  more...
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Dysplastic changes in white blood cell (WBC) lineage (dysmyelopoiesis) involve myeloid hyperplasia with an increased number of myeloblasts and an expanded myelocyte and metamyelocyte population (midstage bulge). This separates it from acute leukemia (leukemic hiatus or absence of mid stage). In the FAB classification, the percentage of myeloblasts separates RA (< 5%), RAEB (5-20%), RAEB in transformation (>20, < 30%), and acute myeloid leukemia (AML; >30%).

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