Lymphoblastic lymphoma in a female with chronic granulocytic leukaemia.

In a 18 years old, Ph1 negative woman a lymphoblastic lymphoma developed after 16 months of treatment for juvenile form of CGL. In the course of the disease we observed twice the myeloblastic transformation and once the low differentiated transformation of CGL. Based on available methods we are not in a position to exclude a particular form of lymphoblastic transformation of CGL involving lymph nodes without leukaemic blood picture.