The nodules may pre-date the appearance of rheumatoid arthritis by several years. Otherwise prognosis is as for RA; lung disease may remit spontaneously, but pulmonary fibrosis may also progress.
Caplan's syndrome
Wagner's disease
Frey's syndrome
Alvarez' syndrome
Bowen–Conradi syndrome
Copenhagen disease
Freiberg disease
Barraquer–Simons syndrome