Changes

*Grossly:

*Grossly:

**[[Tracheitis|Tracheo]][[Bronchitis#Infectious causes of bronchitis or bronchiolitis|bronchitis]], airway obstruction -> [[Atelectasis|atelectasis]]

**[[Tracheitis|Tracheo]][[Bronchitis#Infectious causes of bronchitis or bronchiolitis|bronchitis]], airway obstruction -> [[Atelectasis|atelectasis]]

**[[Pleural Cavity & Membranes Inflammatory - Pathology|Pleura]] normal or covered with serous or serofibrinous exudate

**Pleura normal or covered with serous or serofibrinous exudate

**[[Pleural Cavity & Membranes Inflammatory - Pathology|Pleural cavity]] filled with excess fluid

**[[Hydrothorax|Pleural cavity]] filled with excess fluid

**Lung lesions  

**Lung lesions  

***Clear demarcation of lesions in cranial and middle lobes  

***Clear demarcation of lesions in cranial and middle lobes