Could you explain what is malignant peritoneal mesothelioma?

Ca of lung lining: Your intestines are surrounded by a lubricated lining called the peritoneum. This lining allows your intestines to move against your abdominal wall without friction. When these cells become cancerous, it is called a malignant peritoneal mesothelioma. Mesothelioma are difficult cancers with few effective treatments. A single day of radiation to the biopsy site can prevent local invasion.