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Congenital dyserythropoietic anaemia

a group of autosomal recessive anaemias characterised by ineffective erythropoiesis, bone marrow erythroblastic multinuclearity, and secondary haemochromatosis. Three types are described:

type i, macrocytic, megaloblastic anaemia with erythroblastic internuclear chromatin bridges, type II,, normoblastic anaemia with multinucleated erythroblasts, type III, macrocytic anaemia with erythroblastic multinuclearity and gigantoblasts.