Changes

*'''Increased vascular hydrostatic pressure''' resulting from inappropriate activation of the renin-angiotensin-aldosterone system (RAAS) in '''portal hypertension''' or '''congestive heart failure'''.

*'''Increased vascular hydrostatic pressure''' resulting from inappropriate activation of the renin-angiotensin-aldosterone system (RAAS) in '''portal hypertension''' or '''congestive heart failure'''.

*'''Vasculitis''', caused by '''[[Feline Infectious Peritonitis|feline infectious peritonitis virus]]''' (FIPV) or '''neoplasia'''.  For further discussion of the effusion encountered with FIP, see [[Feline Infectious Peritonitis|here]].

*'''Vasculitis''', caused by '''[[Feline Infectious Peritonitis|feline infectious peritonitis virus]]''' (FIPV) or '''neoplasia'''.  For further discussion of the effusion encountered with FIP, see [[Feline Infectious Peritonitis|here]].

*'''Strangulation of abdominal or thoracic organs''' may lead to the production of a modified transudate (which will develop into an exudate if untreated).  This may occur with '''lung lobe torsion''', '''torsion of the spleen''' or of a liver lobe or if part of the liver becomes strangulated within a [[Diaphragmatic Rupture|'''diaphragmatic rupture''']].  

*'''Strangulation of abdominal or thoracic organs''' may lead to the production of a modified transudate (which will develop into an exudate if untreated).  This may occur with '''lung lobe torsion''', '''torsion of the spleen''' or of a [[Liver Torsion|liver lobe]] or if part of the liver becomes strangulated within a [[Diaphragmatic Rupture|'''diaphragmatic rupture''']].  

*'''[[Chylous Effusion|Chylous effusions''']] are sometimes considered to be a type of modified transudate.  

*'''[[Chylous Effusion|Chylous effusions''']] are sometimes considered to be a type of modified transudate.

==Diagnosis==

==Diagnosis==