RT Journal Article SR Electronic T1 Transient erythroblastopenia of childhood with CD10, TdT, and cytoplasmic mu lymphocyte positivity in bone marrow. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 857 OP 859 DO 10.1136/jcp.43.10.857 VO 43 IS 10 A1 Foot, A B A1 Potter, M N A1 Ropner, J E A1 Wallington, T B A1 Oakhill, A YR 1990 UL http://jcp.bmj.com/content/43/10/857.abstract AB Over three years, three children presented with anaemia, reticulocytopenia, and marrow erythroblastopenia. A pronounced lymphocytosis was also evident in two of the marrow aspirates, with increased numbers of cells bearing the immunophenotype TdT+, CD10+ HLA DR+, and cytoplasmic mu +, and reported to be compatible with acute lymphoblastic leukaemia (ALL). The clinical course of the illness was fully compatible with transient erythroblastopenia of childhood (TEC), and all three children remained well one to four years after initial presentation. It is concluded that increased numbers of lymphoid cells with a common or pre-B ALL phenotype may be found in bone marrow aspirates of children with TEC, and should not be misdiagnosed as acute leukaemia.