Sandbox:MDS

Name	Description
Refractory anemia	Less than 5% primitive blood cells (myeloblasts) in the bone marrow and pathological abnormalities primarily seen in red cell precursors.
Refractory anemia with ring sideroblasts (RARS)|	Less than 5% myeloblasts in the bone marrow, but distinguished by the presence of 15% or greater red cell precursors in the marrow being abnormal iron-stuffed cells called ringed sideroblasts.
Refractory anemia with excess blasts (RAEB)	5-20% myeloblasts in the marrow.
Refractory anemia with excess blasts in transformation (RAEB-T)	21-30% myeloblasts in the marrow (>30% blasts is defined as acute myeloid leukemia).
Chronic myelomonocytic leukemia (CMML)	Less than 20% myeloblasts in the bone marrow and greater than 1*109/L monocytes in peripheral blood.

Old system	New system
Refractory anemia	Refractory cytopenia with unilineage dysplasia
Refractory anemia with ringed sideroblasts	Refractory anemia with ring sideroblasts
	Refractory cytopenia with multilineage dysplasia
Refractory anemia with excess blasts	Refractory anemias with excess blasts I and II
Refractory anemia with excess blasts in transformation I–IV	5q - syndrome
Chronic myelomonocytic leukemia	Myelodysplastic-myeloproliferative overlap syndromes
	Refractory cytopenia of childhood
	Unclassifiable myelodysplastic syndrome