Progressive massive fibrosis (PMF), characterized by the development of large conglomerate masses of dense fibrosis (usually in the upper lung zones), can complicate silicosis[1] and coal worker's pneumoconiosis.[2] Conglomerate masses may also occur in other pneumoconioses, such as talcosis,[3] berylliosis (CBD),[3]kaolin pneumoconiosis,[4] and pneumoconiosis from carbon compounds,[4] such as carbon black, graphite, and oil shale. Conglomerate masses can also develop in sarcoidosis,[5] but usually near the hilae and with surrounding paracicatricial emphysema.
The disease arises firstly through the deposition of silica or coal dust (or other dust) within the lung, and then through the body's immunological reactions to the dust.
https://en.wikipedia.org/wiki/Progressive_massive_fibrosis
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