Pure red cell aplasia associated with chronic neutrophilic leukemia: A case report.

A 79-yesr-old woman was admitted to the hospital with evidence of pure red cell aplasia and chronic neutrophilic leukemia. Bone marrow aspiration showed almost absence of erythropoiesis, marked hyperplastic granulopoiesis with normal maturation and normal megakaryocytes. Serum vitamin B12, unsaturated vitamin B12 binding capacity, transcobalamin I and transcobamin III increased considerably. Chronic myelocytic leukaemia could be ruled out by the blood and bone marrow examination and a high leucocyte alkaline phosphatase score. This case of pure red cell aplasia accompanied by proliferative feature in other cell lines is an example of a link between erythrodysplastic and myeloproliferative disorders.