A 72-year-old female with adult Still's disease.

We treated a 72-year-old woman with adult Still's disease. The diagnosis was made on the basis of a prolonged, high grade, quotidian fever, polyarthritis, maculopapular skin rashes and exclusion of other possible diseases. A high serum ferritin value was a key factor both in making the diagnosis and in the follow-up. The patient responded to the administration of oral prednisolone at 30 mg/day, which was tapered to 10 mg/day, with no recurrence of symptoms. This disorder can be an important cause of prolonged fever in the elderly as well as in the younger population.