Une alpha thalassémie acquise chez un patient de 86 ans avec un syndrome myélodysplasique

Abstract

BackgroundAlpha thalassemia-myelodysplastic syndrome (ATMDS) is one of the possible complications related to the genetic instability typical of clonal hemopoietic disorders such as myelodysplastic syndromes (MDS). Hemoglobin H acquisition, which is hemoglobin without alpha chains and with 4 beta chains is the hallmark of this disease. ObservationAn 86-year-old male with chronic, microcytic anemia was referred due to a fall in his hemoglobin level. The blood smear was remarkable for intense anisocytoses and poikilocytosis. Bone marrow analysis was followed by a diagnosis of MDS with a good prognostic score. Peripheral blood coloration with brilliant cresyl blue showed “golf ball-like” erythrocytes. Hemoglobin electrophoresis is notable for the presence of H hemoglobin. The new generation sequencing confirmed the diagnosis of ATMDS showing a non-sense mutation in the gene ATRX. ConclusionThe diagnosis of ATMDS should be considered in the presence of the association of MDS, microcytic anemia and marked blood smear abnormalities such as anisocytosis and poikilocytosis. A little less than 10% of all MDS are complicated by ATMDS.