A patient with Ph1(Philadelphia chromosome) positive chronic granulocytic leukemia and extramedullary blast transformation (crisis) in lymph nodes of the neck and axillae which appeared after a 4-year treatment with busulfan, is presented. Biopsy of lymph node and histopathological examination showed lymphoblastic infiltration. The patient was treated with radiotherapy and chemotherapy with protocol COP. He survived 7 months and expired due to renal insufficiency.