Description
Each specimen is a slice of lung, dark in colour and showing numerous circumscribed black
nodules, up to 0.5 cm. in diameter; in some areas, each shows a periphery of white scar tissue. On
the pleural surface of each specimen there is a scar associated with a black lesion. The nature of
the irritant in the lungs has not been established, but this man was a welder for many years.