Felty's syndrome without splenomegaly.

A woman with chronic rheumatoid arthritis and severe granulocytopenia but without splenic enlargement by physical examination or radionuclide scanning was studied for granulocyte-bound immunoglobulin G (IgG) and serum antigranulocyte antibodies. Prior to splenectomy 73 to 110 X 10(-14) g/cell of IgG were detected on the patient's granulocytes, a value in the range (20 to 220 X 10(-14) g) found in 16 patients with classic Felty's syndrome. Granulocyte-bound IgG in 21 patients with rheumatoid arthritis without Felty's syndrome was less than 20 X 10(-14) g. Following splenectomy, the patient had a partial correction of her peripheral granulocyte count, and granulocyte bound IgG was repeated less than 20 X 10(-14) g/cell. When paraformaldehyde-fixed granulocytes, obtained either from normal donors or from the patient after splenectomy, were incubated in the patient's serum obtained before splenectomy, more IgG was bound than with control serums from patients with rheumatoid arthritis. Similar results were obtained when serums from patients with classic Felty's syndrome were incubated with paraformaldehyde-fixed granulocytes. Thus, patients with rheumatoid arthritis without overt splenic enlargement may have pathophysiologic Felty's syndrome, and in vitro studies such as these may be used to define this process.