What is asbestosis?

Pneumoconiosis cause diffuse interstitial fibrosing lung disease w/presence of fibers, asbestos is a family of fibrous silicates (most used is chrysotile), fibers of 200 microm are not stopped through upper airway reach distal lungs. Numerous circumstances (cement 80% of asbestos use in france, electrical insulation, thermal , naval and automobile industries and filters, asbestos sale banned since 1997 in France) Asbestosis is when asbestos is inhaled in bare mineral fibers which in lungs are covered by ferruginous sheath, found either in alveolar washing/ biopsy/ pulmonary excision. Asbestos body is ferruginous sheath highlighted by iron staining (Perls stain)