(my-eh-lo-diss-PLASS-tik SIN-dromez) A group of disorders where the bone marrow bone marrow: The soft, spongy tissue inside most bones. Blood cells are formed in the bone marrow. does not work well, and the bone marrow cells fail to make enough healthy blood cells. Myelo refers to the bone marrow. Dysplastic means abnormal growth or development. People with MDS have low blood cell count for at least 1 blood cell type. Also, the bone marrow and blood contain blood cells with an abnormal shape, size, or look. Symptoms vary greatly from person to person. The differences depend on which blood cells are affected.
