title: [Erythroblastopenia in a child with immune deficiency and hyper IgM].
abstract: The authors report the case of a boy with a history of recurrent infections, who presented with erythroblastopenia at age 5 years. An immune deficiency with hyper IgM was found. Erythroblastopenia appeared to be related to a serum inhibitor of erythropoiesis. This inhibitor was present in the serum IgM fraction and acts by blocking the erythropoietic activity of a soluble substance in the serum, which is not erythropoietin but which could be a cofactor of this hormone. A series of 5 plasma exchanges, performed in 10 days, permitted to clear the inhibitor and induced remission, still persisting after a 12 month follow-up.
mesh_terms: D002675:Child, Preschool; D004900:Erythroblasts / Q000166:cytology*; D004920:Erythropoiesis; D005500:Follow-Up Studies; D006801:Humans; D007075:Immunoglobulin M / Q000032:analysis*; D007153:Immunologic Deficiency Syndromes / Q000097:blood* / Q000276:immunology; D008297:Male; D010951:Plasma Exchange
chemical_list: D007075:Immunoglobulin M
vernacular_title: Erythroblastopénie chez un enfant porteur d'un déficit immunitaire avec hyper IgM.