All are true regarding pneumoconioses EXCEPT:
(Centrilobular emphysema is seen in pneumoconioses) (1552-57-H 16th) (1615-HI7th)PNEUMOCONIOSES - are chronic fibrotic lung diseases caused by the inhalation of coal dust and various other inert, inorganic or silicate dusts* Asbestosis - no specific therapy is available, supportive care is same as with diffuse interstitial fibrosis (Glucocorticoids are the mainstay of therapy in interstitial lung disease) (1557-H 16th)* Silicosis - 'egg-shell' pattern, associated with reticular pattern of irregular densities.* Caplan's syndrome - First describes in coal minors but subsequently found in patients with a variety of pneumoconiosis, includes seropositive rheumatoid arthritis with characteristic PMF.EmphysemaCentriacinar - Most frequently associated with cigarette smokingPanacinar - Observed in cti antitrypsin deficiency