1. Pneumoconiosis Dr. Rasha Salama PhD Community Medicine Suez Canal University Egypt

2. Definition Pneumoconiosis is a generic name covering the group of lung disorders which result from the inhalation of “inorganic dust” Pneumoconiosis is a generic name covering the group of lung disorders which result from the inhalation of “inorganic dust”

3. Classification Pneumoconiosis is usually divided into three groups: Pneumoconiosis is usually divided into three groups: Major pneumoconiosis Major pneumoconiosis Minor pneumoconiosis Minor pneumoconiosis Benign pneumoconiosis Benign pneumoconiosis

4. Major Pneumoconiosis Inhalation of some dusts results in “major fibrosis” of the lungs, which results in interference of lung architecture or lung function tests. Inhalation of some dusts results in “major fibrosis” of the lungs, which results in interference of lung architecture or lung function tests. As: As: Silica  silicosis Silica  silicosis Asbestos  asbestosis Asbestos  asbestosis Talc  talcosis Talc  talcosis Coal  coal workers pneumoconiosis (anthracosis) Coal  coal workers pneumoconiosis (anthracosis)

5. Minor Pneumoconiosis Inhalation of some dusts results in “minor fibrosis” of the lungs Inhalation of some dusts results in “minor fibrosis” of the lungs There is minimal fibrosis of the lungs without interference of lung architecture or lung function tests. There is minimal fibrosis of the lungs without interference of lung architecture or lung function tests. These dusts include: These dusts include: Clay Clay Koalin Koalin Mica Mica Feldspar (non-fibrous silicates) Feldspar (non-fibrous silicates)

6. Major pneumoconiosis Major pneumoconiosisand Minor pneumoconiosis Minor pneumoconiosis are called “ Fibrotic Pneumoconiosis”

7. Benign Pneumoconiosis There isn't any reaction in the lungs, but dust deposition casts a shadow in x-ray of the lung. There is no fibrosis and no disturbance of lung functions. There isn't any reaction in the lungs, but dust deposition casts a shadow in x-ray of the lung. There is no fibrosis and no disturbance of lung functions.

8. Examples of Benign Pneumoconiosis It can result from the inhalation of: It can result from the inhalation of: Iron dust  sidrosis Iron dust  sidrosis Tin dust  stannosis Tin dust  stannosis Calcium dust  chalicosis Calcium dust  chalicosis They are characterized by the presence of small rounded dense opacities on a chest film due to perivascular collections of dusts. They are characterized by the presence of small rounded dense opacities on a chest film due to perivascular collections of dusts. Hilar lymph nodes may be prominent. Hilar lymph nodes may be prominent. The deposits in the lung disappear when exposure is discontinued. The deposits in the lung disappear when exposure is discontinued.

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