[A 17-year-old female patient with recurring fever, chills, exanthema, myalgia and polyserositis].

The 17-year-old was admitted for investigation of a fever persisting for three weeks in spite of antibiotic treatment. Based on the clinical picture presenting with fugitive exanthema during febrile episodes, myalgia, polyserositis, leucocytosis with toxic granulations and-- after an antibiotic window--negative cultures of all investigated fluids (blood, pleural and peritoneal fluid), adult-type Still's disease was diagnosed. Treatment with steroids and indomethacine was only temporarily successful. Therapeutic stabilization first occurred under administration of phenylbutazone. The course was complicated by three surgical abdominal interventions because of an unclear acute abdomen, a strangulation ileus and a small-bowel perforation.