Changes

*Grossly:

*Grossly:

**Multiple firm nodules, usually no encapsulation

**Multiple firm nodules, usually no encapsulation

**Partial [[Lungs - ventilation#Atelectasis (Collapse)|atelectasis]]

**Partial [[Lungs Ventilation - Pathology#Atelectasis (Collapse)|atelectasis]]

*Histologically:

*Histologically:

**Pyogranulomatous lesions

**Pyogranulomatous lesions

***On its own causes Mycoplasmal ("Cuffing") pneumonia responsible for [[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|bronchitis and bronchiolitis]] and [[Lungs - inflammatory#Infectious causes of pneumonia|bronchointerstitial pneumonia]]

***On its own causes Mycoplasmal ("Cuffing") pneumonia responsible for [[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|bronchitis and bronchiolitis]] and [[Lungs - inflammatory#Infectious causes of pneumonia|bronchointerstitial pneumonia]]

***It is thought to pick up host antigens in order to prevent recognition by the body defences as foreign

***It is thought to pick up host antigens in order to prevent recognition by the body defences as foreign

***In uncomplicated mycoplasma infection, the lesions are generally mild and consist of patchy red/purple areas of [[Lungs - ventilation#Atelectasis|atelectasis]] in the '''cranio-ventral lung lobes'''

***In uncomplicated mycoplasma infection, the lesions are generally mild and consist of patchy red/purple areas of [[Lungs Ventilation - Pathology#Atelectasis|atelectasis]] in the '''cranio-ventral lung lobes'''

***More confluent areas can develop with an underlying bronchointestitial pneumonia and resulting atelectasis

***More confluent areas can develop with an underlying bronchointestitial pneumonia and resulting atelectasis

***''M. bovis''  

***''M. bovis''