Refractory anemia with ringed sideroblasts


NCI: A myelodysplastic syndrome characterized by an anemia in which 15% or more of the erythroid precursors are ringed sideroblasts. The ring sideroblast is an erythroid precursor in which one third or more of the nucleus is encircled by granules which are positive for iron stain. It occurs primarily in older individuals. The median survival exceeds 5 years. (WHO, 2001)

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