The Myelodysplastic syndromes are divided into subtypes based on the type of cells involved, such as white blood cells, red blood cells, and platelets. - Myelodysplastic syndromes with single-lineage dysplasia - Myelodysplastic syndrome with multi-lineage dysplasia - Myelodysplastic syndrome with ring sideroblasts - Myelodysplastic syndromes with isolated del(5q) chromosome abnormality. - Myelodysplastic syndromes with excess blasts - Myelodysplastic syndromes, classifiable.