Staging (Boutin modification of Butchart staging):
IA --- confined to ipsilateral parietal/diaphragmatic pleura
IA --- confined to ipsilateral parietal/diaphragmatic pleura
IB --- + visceral pleura, lung, pericardium
II ---- invasion of chest wall/mediastinum (esophagus, heart, contralateral pleura) or metastases to thoracic lymph nodes
III ---- penetration of diaphragm with peritoneal involvement or metastases to extrathoracic lymph nodes
IV ---- distant hematogenous metastases
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