RESUMO
To study probability of occurrence of infectious peritonitis in a affected cat with severe ascite. Case study. A five months old male domestic short hair cat. In the first step, clinical examination, radiology and sonography interpretation, CBC, serum biochemical analysis and electrophoresis were done. After then abdominocyntesis was done and total protein and the ratio of albumin to globulin of the abdominal effusion was measured. Post mortem examination and histopahtological survey was done on tissue samples. In clinical examination mild pyrexia [40[degree sign] C], pale mucous membrane, anorexia and severe abdominal distention were revealed. The abdominal effusion was clear, straw colored, viscose and foamy in shaking. Radiology and sonography revealed severe distention of abdominal cavity was due to acsite. In necropsy, there was straw colored inflammatory exudates with diffuse granular fibrinous exudation covering serosal surfaces of intestine or floating in the abdominal effusion. Histopathological findings showed lymphocytic-plasmocytic infiltration and focal necrosis in-brain, heart, liver, kidneys, mesenteric lymph nodes and intestines. Failure of treatments of abdominal effusion [high levels of total protein decrease in albumin to globulin ratio and cytological status], characteristics of abdominal effusion, serum electrophoretic findings in accordance with clinical and histopathological findings made diagnosis