Peritonitis and massive granulocytic infiltration of the spleen in adult Still's disease.

A case of adult Still's disease is described which, in addition to the more common manifestations, also included abdominal discomfort. Upon laparoscopy, peritonitis was disclosed; a biopsy showed massive granulocytic infiltration of the spleen which could not be attributed to an infectious disease. The patient did not improve on conventional therapeutic modalities but required intensive combination therapy consisting of high dose acetylsalicylic acid, prednisone, and slow-reacting substances before entering remission.