Mesothelioma Symptoms are often discovered by a CT scan or chest xrays. Mesothelioma  is a form of cancer which causes malignant cells in the outer lining of the lungs after exposure to asbestos materials in the air. Mesothelioma Symptoms include shortness of breath, chest pains or abnormal loss in body weight. Treatment of mesothelioma cancer after diagnosis often ends in a poor prognosis according to information aquired.