Mesothelioma is relatively uncommon tumor compared to other thoracic tumors. It is interesting that there is a strong relationship between occurrence of malignant mesothelioma and exposure to asbestos, which was established during the last two decades. Malignant mesothelioma is discouraging in viewing its treatments and survival rates. Surgery with ancillary treatment, such as radiotherapy and chemotherapy, were still palliative, although encouraging results were reported. Between 1958 to 1983 at NMC, we have been experienced 6 cases of mesothelioma, confirmed by pathohistologic findings. The patients were distributed between 19 to 52 y-o age & were 5 males and 1 female. There was evidence of exposure to asbestos in 1 case. The method of operation were decortication [1], decortication with removal of tumor [1], pleuropneumonectomy with chemotherapy [1], chemotherapy [1], exploratory thoracotomy [1], and no treatment in 1 case due to private affairs. Histologic findings were 2 cases of benign mesothelioma