A 26-year-old woman was hospitalized for evaluation of persistent fever, migratory arthritis, and general malaise. Eighteen months before admission, Ki-1-positive T-cell lymphoma with inguinal lymphadenopathy, hepatosplenomegaly, and bone marrow localization (stage IV B) had been diagnosed. She received six cycles of CHVmP/BV consisting of cyclophosphamide, adriamycin, teniposide, prednisone, bleomycin, and vincristine. Six months later she developed skin lesions on her legs and chest, which later spread to her abdomen and extremities. A biopsy of one of the lesions showed perivascular infiltrates of mainly CD30 (Ki-1)-positive cells. A diagnosis of lymphomatoid papulosis (LP) was made. During the following weeks the lesions disappeared spontaneously. Shortly afterwards, she underwent an autologous bone marrow transplantation following BEAC (carmustine, etopiside, cytarabine, and cyclophosphamide) polychemotherapy.One year prior to admission a relapse of the skin lesions had occurred with fever, malaise, and lymphadenopathy. All of these symptoms disappeared without therapy. Follow-up chest X-rays, computed tomographic (CT) scans of the abdomen and thorax, and bone marrow biopsies showed no lymphoma. Five months before admission she had complained of pain and swelling of her left wrist, thumb, and ankle. Tendinitis was diagnosed. Fever then developed with increasing chest pain, dyspnea, and general malaise. A chest X-ray showed cardiomegaly with pleural fluid on the left side. An echocardiogram revealed pericardial effusion. In total, 650 ml of pericardial fluid were aspirated; all cultures including those for tuberculosis and fungi were negative. Cytological examination disclosed no lymphoma cells. Laboratory results revealed weakly positive antinuclear antibodies (ANA), without anti-double-stranded DNA (anti-dsDNA) antibodies. No antibodies against extractable nuclear antigen (ENA) or rheumatoid factor were detected. Serum complement levels were normal.