Peritoneal Mesothelioma Peritoneal Mesothelioma is the cancer of the abdominal lining or stomach lining.  The peritoneal is the membrane that surrounds the abdomen.  Symptoms of peritoneal mesothelioma range from stomach pains, loss of appetite, nasuea, and abdominal swelling.  Fluid commonly accumulates in the abdominal caivty causing the swelling and pain.  The syptoms can become quite serous over time as the swelling will exert great force on surrounding organs and lead to great pain.  Approximately 10-20% of mesothelioma cases are classified as peritoneal mesothelioma.  The survival rate is extremely low and the survival time is often less than 1 year from time of diagnosis.    If this disease is diagnosed early, it is possible to treat it with radiation or chemotherapy.  Using these treatments to stop peritoneal mesothelioma from spreading, it is possible to survive this disease for a long time after. Peritoneal mesothelioma is not very common and thus has not been fully studied.  There are many clinical trials and research studies being conducted to learn more about this deadly disease.