Abstract

Considerable heterogeneity of lymphoblast morphology in childhood B cell acute lymphoblastic leukaemia has been observed. One case showed unusual monocytic features and emphasised the need for marker studies in the accurate definition of acute lymphoblastic leukaemia phenotypes. B cell acute lymphoblastic leukaemia is rare but may have been previously underestimated by morphological misinterpretation. Further information is required to determine if the different morphological features of this condition are of clinical and prognostic importance.