Incidence is currently 1 in 100,000 people but is likely to fall as the coal mining industry declines. It has also been shown to occur in cases of complicated silicosis (marked by progressive massive pneumoconiosis).
Caplan's syndrome
Wagner's disease
Frey's syndrome
Alvarez' syndrome
Bowen–Conradi syndrome
Copenhagen disease
Freiberg disease
Barraquer–Simons syndrome