[Sweet's syndrome in a patient with chronic myeloproliferative disorder during recombinant human granulocyte colony stimulating factor therapy].

A patient with chronic myeloproliferative disorder (CMPD) developed Sweet's syndrome during granulocyte colony-stimulating factor (G-CSF) therapy. A 61-year-old man with essential thrombocythemia was treated with busulfan intermittently since April, 1991. In February, 1993, hepatosplenomegaly with leukoerythroblastosis arose and a diagnosis of myelofibrosis with extramedullary hematopoiesis in the spleen was established. For alleviation of left hypochondralgia due to splenomegaly, he received splenic irradiation in September, 1993. Soon after the irradiation, his peripheral blood revealed pancytopenia and then administration of rhG-CSF was begun on the 9th of October, 1993. One week after G-CSF therapy, he became feverish and painful eruptions on the face and the upper extremities appeared and enlarged. Skin biopsy resulted in a diagnosis of Sweet's syndrome. Treatment with oral prednisone, 30 mg daily, was begun, and rapid and significant improvement of the skin lesions was obtained. The pathogenesis of Sweet's syndrome remains obscure, but careful follow up is necessary for patients during G-CSF therapy with respect to development of Sweet's syndrome.