Morphoclinical and paraclinical features of feline infectious peritonitis (FIP)

Abstract

The study aims to identify the morphoclinical and paraclinical elements useful in the diagnosis of FIP, given that the symptoms are sometimes uncharacteristic, varied and often similar to those of other diseases. The morphoclinical features of 32 patients diagnosed with FIP were evaluated. In 26 patients (81.25%), the predominant symptomatology was similar: intermittent fever, loss of appetite, weakness, dyspnoea and physical signs of peritoneal fluid collection. The peritoneal puncture fluid was inflammatory, with numerous large phagocytes (neutrophils and macrophages), lymphocytes and, in some cases, red blood cells. The cell blood count (CBC) showed the existence of normocytic, hypochromic and hypoplastic anaemia and the presence of an active systemic inflammatory process, confirmed by the presence of aggregated platelets and segmented and vacuolated neutrophils in the stained smear May Grunwald Giemsa (MGG). Biochemical blood examination revealed the evolution of a physiopathological syndrome of hepatocytolysis, increased tissue catabolism and haemolytic anaemia. These results confirm that FIP is usually a systemic disease with polymorphic clinical signs, and biochemical blood tests, unlike CBC, have more prognostic value and lower value for suspecting the disease. However, sometimes, lesions and associated clinical signs in a single organ predominate. Thus, in three patients (9.37%), the predominant symptomatology was hepato-digestive with hepatocellular jaundice; one patient had obvious clinical signs of renal failure, one had signs of cortical syndrome, and one patient showed periosteal lesions (granulomatous osteitis). These results indicate that some less common lesions in cats, such as osteitis granulomatous, should be included in the list of FIP lesions.