A rare complication of metastatic lung disease treatment

A) Chest x-ray: Pneumopericardium covered the heart, and volume loss due to right upper lobectomy is seen in the right hemithorax. B) Thoracic CT: There is a cavitary lesion (thick arrow) in the right paracardiac area and pneumopericardium (star). The image indicates a defect between the cavitary lesion and the pericardium (thin arrow). Additionally, in the right lung, widespread interstitial densities and minimal pneumothorax in the right hemithorax are seen. (After Erlotinib treatment.) C) Thoracic CT: A 20x12 mm diameter solid nodule neighboring the pericardium is seen in the right hemithorax (arrow). (Before Erlotinib treatment.)