Caplan's syndrome is
Rheumatoid Arthritis + Pneumoconiosis nodules = Caplan's syndrome.
Neutropenia + Splenomegaly + Nodular RA = Felty's syndrome.
Splenomegaly + Neutropenia
Rheumatoid Arthritis + Pneumoconiosis
Pneumoconiosis + Splenomegaly
Pneumoconiosis + Neutropenia