Changes

*Diffuse inflammatory process which occurs distal to the terminal bronchioles

*Diffuse inflammatory process which occurs distal to the terminal bronchioles

*Characterised by thickening and fibrosis of the alveolar walls  

*Characterised by thickening and fibrosis of the alveolar walls  

*The precise underlying aetiology of this condition is obscure and it is likely to represent the end stage of a variety of initial insults including '''EAA''' and [[Lungs Inflammatory - Pathology#Acute bovine pulmonary emphysema and oedema (ABPEE)|fog fever]]

*The precise underlying aetiology of this condition is obscure and it is likely to represent the end stage of a variety of initial insults including '''EAA''' and [[Acute Bovine Pulmonary Emphysema and Oedema|fog fever]]

*Progression from an acute exudative phase through a proliferative phase (proliferation of type II pneumocytes) to a final irreversible stage of fibrosis is the hallmark of DFA

*Progression from an acute exudative phase through a proliferative phase (proliferation of type II pneumocytes) to a final irreversible stage of fibrosis is the hallmark of DFA

*The rate of the ensuing fibrosis is heavily dependant on the intensity of the inflammation associated with it  

*The rate of the ensuing fibrosis is heavily dependant on the intensity of the inflammation associated with it