Congenital dyserythropoietic anemia type IV (CDA IV) has been described with typical morphologic features of CDA II but a negative acidified-serum test. Presentation
CDA type IV is characterized by mild to moderate splenomegaly. Hemoglobin is very low and patients are transfusion dependent. MCV is normal or mildly elevated. Erythropoiesis is normoblastic or mildly to moderately megaloblastic. Nonspecific erythroblast dysplasia is present. Genetics
Congenital dyserythropoietic anemia type IV is an autosomal dominant inherited red blood cell disorder characterized by ineffective erythropoiesis and hemolysis resulting in anemia. Circulating erythroblasts and erythroblasts in the bone marrow show various morphologic abnormalities. Affected individuals with CDAN4 also have increased levels of fetal hemoglobin. Diagnosis
Treatment
Treatment consists of frequent blood transfusions and chelation therapy. Potential cures include bone marrow transplantation and gene therapy. See also
Congenital dyserythropoietic anemia
Thalassemia
Hemoglobinopathy
List of hematologic conditions

References
Further reading
Congenital dyserythropoietic anemia at the US National Institutes of Health Home Genetic Reference]


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An abscess of the thymus (also known as "Dubois abscesses") is a condition that is one of many possible causes of cysts in the mediastinum. It can present with chest pain behind the sternum.It can be associated with congenital syphilis.Although the thymus is usually classified with the immune system, thymic diseases are classified with endocrine disorders in ICD-9 and ICD-10. References


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