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Peritoneal Mesothelioma, or abdominal mesothelioma is found in the abdomen in a thin membrane called the peritoneum. Peritoneal mesothelioma is a rapidly fatal primary peritoneal malignancy with an average survival time of less than 1 year, mainly because there is no effective treatment. Peritoneal mesothelioma is a tumor of this peritoneal membrane. Symptoms of peritoneal mesothelioma include abdominal swelling, loss of appetite, and weakness. The only known cause to this disease is exposure to asbestos. Peritoneal mesothelioma take years to develop, and the exposure is likely to have taken place 20 or more years ago. This type of mesothelioma is the less common and is found in less than 25% of all mesothelioma cases. Like pleural mesothelioma, peritoneal mesothelioma can be either benign or malignant.