Abstract
Sclerosing encapsulating peritonitis (SEP) was diagnosed in one dog and three cats. Clinical signs included vomiting, anorexia, palpable abdominal mass and ascites containing large numbers of blood cells, macrophages, inflammatory cells and reactive mesothelial cells. Survey and contrast radiography and computed tomography revealed that the small intestine was tightly coiled and was in malposition. Exploratory laparotomy revealed that the abdominal mass was mainly consisted of the small intestine, omentum and retropertioneal fat. These organs formed a large mass coverd with thick layers of fibrous tissue. Adhesion of the small intestine and fibrous tissue over the retroperitoneum was abrupted. Although treatments including administration of diuretics, corticosteroids and antibiotics were performed, the survival time ranged from 3 to 57 days.
