第五章骨髓增生异常综合征骨髓增生异常综合征（myelodysplasticsyndrome，MDS）是一组临床表现为难治性贫血、感染和出血，外周血象表现为血细胞减少，骨髓为活跃或明显活跃增生，三系有病态造血，或原始细胞和早期细胞增多的综合征。
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