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*Permanent, abnormal saccular or cylindrical dilation of  bronchi
 
*Permanent, abnormal saccular or cylindrical dilation of  bronchi
 
*Accumulation of exudate within the lumen and partial rupture of bronchial walls
 
*Accumulation of exudate within the lumen and partial rupture of bronchial walls
*Sequel to [[Bronchi and Bronchioles Inflammatory - Pathology#Chronic bronchitis|chronic bronchitis]] as result of an unresolved persistent [[Lungs Inflammatory - Pathology#Bronchopneumonia|bronchopneumonia]]
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*Sequel to [[Bronchitis#Chronic bronchitis|chronic bronchitis]] as result of an unresolved persistent [[Lungs Inflammatory - Pathology#Bronchopneumonia|bronchopneumonia]]
 
*Chronic inflammation within the bronchial mucosa and wall -> release of proteolytic enzymes from [[Neutrophils|neutrophils]] and macrophages  ->  destruction of supporting structures in the bronchial walls (eg: cartilage, connective tissue) -> weakens the bronchial walls and damages lining mucosal epithelial cells and their cilia (damage to mucociliary escalator)
 
*Chronic inflammation within the bronchial mucosa and wall -> release of proteolytic enzymes from [[Neutrophils|neutrophils]] and macrophages  ->  destruction of supporting structures in the bronchial walls (eg: cartilage, connective tissue) -> weakens the bronchial walls and damages lining mucosal epithelial cells and their cilia (damage to mucociliary escalator)
 
*[[Lungs Ventilation - Pathology#Atelectasis|Atelectasis]] in the surrounding lung parenchyma results in increased inspiratory effort and increased intrathoracic negative pressure during inspiration
 
*[[Lungs Ventilation - Pathology#Atelectasis|Atelectasis]] in the surrounding lung parenchyma results in increased inspiratory effort and increased intrathoracic negative pressure during inspiration
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