Peritoneal Mesothelioma Not Caused by Asbestos Malignant peritoneal mesothelioma forms in the abdomen's lining. It is less prevalent than the pleural form and more women suffer than men. Patients with peritoneal mesothelioma typically exhibit vague symptoms, such as abdominal pain constipation, weight loss or diarrhoea. A specialist in mesothelioma may