An aggressive malignant mesothelioma that arises from the peritoneum. Patients usually present with abdominal pain and ascites. The disease is malignant peritoneal mesothelioma (Monarch Disease Ontology id MONDO_0005512). Also known as: advanced malignant mesothelioma of peritoneum, advanced malignant mesothelioma of the peritoneum, advanced malignant peritoneal mesothelioma, advanced peritoneal malignant mesothelioma, diffuse malignant peritoneal mesothelioma, malignant mesothelioma (disease) of peritoneum, malignant mesothelioma of peritoneum, malignant peritoneal mesothelioma, advanced.