Myelodysplastic syndrome (MDS) represents a group of clonal hematological disorders characterized by progressive cytopenia, and reflects to defects in erythroid, myeloid and megakaryocytic maturation. MDS is more frequently observed in older aged patients with cytogenetic abnormalities like monosomy of chromosome(s) 5 and/or 7. In 50% of de novo MDS cases, chromosomal aberrations are found and rearrangements involving the retinoblastoma ( RB1) gene in 13q14 are found.
Here, we are presenting a case report of a rare biclonal MDS with a karyotype of 45, XY,-4, der(6)t(4;6)(p15.1;p21.3), der(8)t(4;8)(q31.2;q22), t(13;16)(q21.3;p11.2)[ 11]/45, XY, der(7)t(7;13)(p22.2~22.3;q21.3),-13 [ 9]. The patient was diagnosed according to WHO classification as refractory anemia with excess of blasts (RAEB-II).
Immunophenotyping was positive for CD11b, CD11c, CD10, CD13, CD15, CD16 and CD33.