a) Large necrotic mass in the left upper lobe. There is a large amount of contact between the tumour and aortic arch (arrows) and a very irregular delineation of the vessel making tumoral invasion very likely. b) Large mass in the right upper lobe. Despite the large amount of contact between the tumour and the chest wall (arrows), there is no pleural thickening, the angles between the tumour and the chest wall are sharp and the extrapleural fat is preserved suggesting that the mass is not invading the pleura.
