Changes

*Extension of infection from myocardium; rare.

*Extension of infection from myocardium; rare.

*Traumatic penetration of the pericardium;  

*Traumatic penetration of the pericardium;  

**Foreign bodies from the oesophagus or reticulum in cattle; [[Forestomach Inflammation - Pathology#Traumatic_Reticulitis|traumatic reticulo-peritonitis]].

**Foreign bodies from the oesophagus or reticulum in cattle; [[Traumatic_Reticulitis|traumatic reticulo-peritonitis]].

**Fractured ribs; E.g. RTAs in small animals, horses etc.

**Fractured ribs; E.g. RTAs in small animals, horses etc.

[[Image:traumatic pericarditis 2.jpg|right|thumb|125px|<small><center>'''Traumatic pericarditis'''. Courtesy of A. Jefferies</center></small>]]

[[Image:traumatic pericarditis 2.jpg|right|thumb|125px|<small><center>'''Traumatic pericarditis'''. Courtesy of A. Jefferies</center></small>]]

Purulent pericarditis indicates the presence of pyogenic organisms E.g. Staphs

Purulent pericarditis indicates the presence of pyogenic organisms E.g. Staphs

Usually occurs in cattle as a result of traumatic penetration of the pericardial sac with a sharp metallic object or ''wire''.  This is [[Forestomach Inflammation - Pathology#Traumatic_Reticulitis|Traumatic reticulo-peritonitis]]

Usually occurs in cattle as a result of traumatic penetration of the pericardial sac with a sharp metallic object or ''wire''.  This is [[Traumatic_Reticulitis|Traumatic reticulo-peritonitis]]

Death usually occurs before organisation and a constrictive pericarditis can become apparent.

Death usually occurs before organisation and a constrictive pericarditis can become apparent.

[[Image:traumatic reticulitis.jpg|right|thumb|125px|<small><center>'''Traumatic pericarditis'''. Courtesy of A. Jefferies</center></small>]]

[[Image:traumatic reticulitis.jpg|right|thumb|125px|<small><center>'''Traumatic pericarditis'''. Courtesy of A. Jefferies</center></small>]]