Images were submitted to SESC of two cases of hybrid breed, 6 months old swine carcasses with lesions in the abdominal cavity: presence of exudate, adhesions and a whitish to reddish coloration fibrous deposit on the serous membranes .

In Case 1 both the thoracic and the abdominal cavity were involved with a rather reddish exudate (haemorrhage). Case 2 was restricted to the abdominal cavity and it was characterised by adhesions between viscera and the deposited material had a whitish color. The animal had a noticeable loss of weight.

Both macroscopic appearance and subsequent histopathological study are consistent with chronic diffuse peritonitis with an important fibrous component, probably due to chronic fibrinous peritonitis. At this stage of the disease a microbiological analysis would be usless as the causative agent of peritonitis is probably no longer present.

The most common causes of fibrinous poliserositis in swine are: Haemophilus parasuis, Streptococcus suis, Escherichia coli and Mycoplasma hyorrhinis.

Case 1, deposition of fibrous material on the abdominal serosal surfaces.

Case 1, deposition of fibrous material on the abdominal serosal surfaces.

Case 1, detail of the inflammatory exudate.

Case 1, detail of the inflammatory exudate.

Case 2, whitish deposits of fibrous material were observed.

Case 2, whitish deposits of fibrous material were observed.

Case 2, the viscera had adhesions between them and were covered by abundant fibrous tissue.

Case 2, the viscera had adhesions between them and were covered by abundant fibrous tissue.