A 17-year-old white female presented with stage IVB Hodgkin's disease. After chemotherapy and radiotherapy she achieved a complete clinical remission and underwent an autologous bone marrow transplant (ABMT). 22 months later she developed chronic granulocytic leukaemia (CGL). Polymerase chain reaction (PCR) analysis of bone marrow harvested at the time of ABMT did not show any evidence of the bcr-abl sequence that was detectable at the diagnosis of CGL. This case provides further information on the kinetics of the development of CGL and adds to the small pool of data on CGL developing after treatment for Hodgkin's disease.