The main signs and symptoms, which, in combination with the possibly associated symptoms of the primary tumor can lead to suspicion, are the presence of ascites and intestinal obstruction with associated abdominal pain, nausea, vomiting or bloating, and anorexia or weight loss. These symptoms may lead to late diagnosis, are often very difficult to control, and lead to frequent hospitalizations. Importantly, in around 10% of patients undergoing surgery for primary tumor,PC is an incidental finding. Favored sites of the peritoneal cavity include the subphrenic region, lesser sac, bowel surfaces or mesentery, and in the pelvis.