*'''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]]. |