Stage III includes: (T1, T2, N1, M0); (T1, T2, N2, M0); (T3, N0, N1, N2, M0). T1: Pleural mesothelioma with a tumor limited to the ipsilateral parietal pleura with or without mediastinal pleura and with or without diaphragmatic pleural involvement. T2: Pleural mesothelioma with a tumor involving each of the ipsilateral pleural surfaces (parietal, mediastinal, diaphragmatic, and visceral pleura) with at least one of the following: involvement of diaphragmatic muscle; extension of tumor from visceral pleura into the underlying pulmonary parenchyma. T3: Pleural mesothelioma with a locally advanced but potentially respectable tumor. Tumor involving all the ipsilateral pleural surfaces (parietal, mediastinal, diaphragmatic, and visceral pleura) with at least one of the following: involvement of the endothoracic fascia; extension into the mediastinal fat; solitary, completely respectable focus of tumor extending into the soft tissues of the chest wall; nontransmural involvement of the pericardium. N0: No regional lymph node metastasis. N1: Pleural mesothelioma with metastases in the ipsilateral bronchopulmonary or hilar lymph nodes. N2: Pleural mesothelioma with metastases in the subcarinal or the ipsilateral mediastinal lymph nodes including the ipsilateral internal mammary and peridiaphragmatic nodes. M0: No distant metastasis. (AJCC 7th ed.) [from NCI]