A myelodysplastic syndrome characterized by the presence of 5-19% myeloblasts in the bone marrow or 2-19% blasts in the peripheral blood. It includes two categories: myelodysplastic syndrome with excess blasts-1 and myelodysplastic syndrome with excess blasts-2. The disease is Monarch Disease Ontology term MONDO_0019454 (myelodysplastic syndrome with excess blasts). Also known as: MDS-EB, RAEB, myelodysplastic syndrome with Excess blasts, refractory Anaemia with Excess blasts, refractory Anaemia with an Excess of blasts, refractory Anemia with Excess blasts, refractory Anemia with an Excess of blasts.