* Chest radiology shows multiple, round, well defined nodules, usually 0.5-2.0 cm in diameter, which may cavitate and resemble tuberculosis. * Lung function tests may reveal a mixed restrictive and obstructive ventilatory defect with a loss of lung volume. There may also be irreversible airflow limitation and a reduced DLCO. * Rheumatoid factor, antinuclear antibodies, and non-organ specific antibodies may be present in the serum. * Silicosis and asbestosis must be considered in the differential with TB.
Caplan's syndrome
Wagner's disease
Frey's syndrome
Alvarez' syndrome
Bowen–Conradi syndrome
Copenhagen disease
Freiberg disease
Barraquer–Simons syndrome