Definition: It is a situation of persistent or long lasting dilatation of the bronchioles.















Aetiology (brings about):















I. Mechanical -















(a) Inhalation of a international human body.







(b) Force of an aneurysm.







(c) Bronchopulmonary neoplasm.







(d) Calcified tuberculous glands.







(e) Pulmonary fibrosis resulting from -







(i) Bronchopneumonia,







(ii) Syphilis,







(iii