How are refractory anemia with excess blasts (RAEB) and refractory anemia with excess blasts in transition to acute myeloid leukemia (RAEB-T) characterized in the French-American-British (FAB) classifications 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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Answer

RAEB and RAEB-T (see the image below) are characterized by greater than 5% myeloblasts. The higher the percentage of myeloblasts present, the shorter the clinical course and the closer the disease is to acute myelogenous leukemia.

Blood film (1000× magnification) demonstrating a v Blood film (1000× magnification) demonstrating a vacuolated blast in a refractory anemia with excess of blasts in transformation. Courtesy of U. Woermann, MD, Division of Instructional Media, Institute for Medical Education, University of Bern, Switzerland.

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