Definition: It is a issue of chronic or permanent dilatation of the bronchioles.















Aetiology (leads to):















I. Mechanical -















(a) Inhalation of a overseas body.







(b) Stress of an aneurysm.







(c) Bronchopulmonary neoplasm.







(d) Calcified tuberculous glands.







(e) Pulmonary fibrosis resulting from -







(i) Bronchopneumonia,







(ii) Syphilis,







(iii) Tuberculosis







(iv)