Pure red cell aplasia characterized by erythropoietic maturation arrest.  Response to anti-thymocyte globulin. 
Pure red cell aplasia is a syndrome characterized by markedly decreased erythropoiesis.  On bone marrow examination, there are typically less than 0.5 percent erythroblasts, but sometimes a picture of maturation arrest can be seen.  This report describes a patient with maturation arrest of erythropoiesis at the basophilic normoblast stage who had a response to an eight-day course of anti-thymocyte globulin with a return of normal erythropoiesis.