In a 31-year-old Japanese man with cytophagic histiocytic panniculitis (CHP) remission was achieved by a combination of combined chemotherapy CHOPand cyclosporin A treatment. He was admitted to our hospital in January 1994 with recurrent high fever of 40.2°C and tender and violaceous subcutaneous nodules on his trunk, arms and legs. Hedeveloped pancytopenia, hemorrhagic diathesis, liver dysfunction. Histological examination of the biopsied subcutaneous nodule revealed a lobular panniculitis with fat necrosis and a massive infiltration of histiocytes phagocytosing nuclear debris. He was treated initially with 40 mg/day prednisolone. However, following a reduction in prednisolone dosage, his symptoms reappeared. CHOP(cyclophosphamide, doxorubicin, vincristine and prednisolone) therapy was then initiated. Three courses of CHOPtreatment alleviated his symptomsand cyclosporin A was used to maintain his condition for 15 months. His medication was then discontinued and he has been in complete remission for 10 months. Combined treatment of cyclosporin A and CHOPcombined chemotherapy was shown to be effective for this patient with severe CHP. (Internal Medicine 38: 296-301, 1999)