Peritoneal Mesothelioma Not Caused by Asbestos Malignant peritoneal mesothelioma develops in the lining of the abdomen. It is less common than pleural mesothelioma. it is more common in women than men. Patients with peritoneal mesothelioma typically have vague symptoms such as abdominal pain constipation, weight loss or diarrhoea. A specialist