Changes

*these two should not be confused since the prognosis is very different following surgery  

*these two should not be confused since the prognosis is very different following surgery  

===Emphysema===

===Emphysema===

Interstitial emphysema can occur in the respiratory lymph nodes and is common in cases of dyspnoea. This condition is seen most commonly in the bovine lung which, due to the well developed pulmonary lobulation and extenive loose interstitial lung tissue permits a collection of gas bubbles in the bronchial and mediastinal lymph nodes. Gas travels to these nodes after gaining entry to the many lymphatic vessels present in the interstitial tissue  

Interstitial emphysema can occur in the respiratory lymph nodes and is common in cases of dyspnoea. This condition is seen most commonly in the bovine lung which, due to the well developed pulmonary lobulation and extensive loose interstitial lung tissue permits a collection of gas bubbles in the bronchial and mediastinal lymph nodes. Gas travels to these nodes after gaining entry to the many lymphatic vessels present in the interstitial tissue

 

===Neoplasia===

===Neoplasia===

Primary lymph node tumours include lymphosarcoma (lymphoma) which affect lymphoid cells with lymph node enlargement. The nodes become smooth, pale and hemogenous but may have areas of necrosis; this condition may cause pseudo-hyperparathyroidism.

Primary lymph node tumours include lymphosarcoma (lymphoma) which affect lymphoid cells with lymph node enlargement. The nodes become smooth, pale and hemogenous but may have areas of necrosis; this condition may cause pseudo-hyperparathyroidism.