骨髓增生异常综合征 (MDS)为克隆造血干细胞病。形态学有病态造血现象 ,临床上有骨髓衰竭血细胞减少引起的贫血、发热和出血。自然病程从慢性期至快速向白血病转化 ,最终于 MDS期骨髓衰竭并发症或白血病期而不治。为此 ,MDS曾被称为白血病前期、少原始细胞性白血病。又因其形态 Myelodysplastic syndrome (MDS) is a clone of hematopoietic stem cell disease. Morphology has morbid hematopoietic phenomena, clinical anemia caused by bone marrow depletion of blood cells, fever and bleeding. Natural course of disease from chronic to rapid conversion to leukemia, and ultimately in the MDS bone marrow failure complications or leukemia and died. To this end, MDS has been referred to as pre-leukemia, fewer blast cell leukemia. Because of its shape