Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The cardiac , mediastinal and hilar contours appear unchanged , allowing for differences in technique . There are a number of round nodular densities projecting over each upper lung , but more numerous and discretely visualized in the left upper lobe , similar to prior study . However , in addition , there is a more hazy widespread opacity projecting over the left mid upper lung which could be compatible with a coinciding pneumonia . Pulmonary nodules in the left upper lobe are also not completely characterized on this study . There is no pleural effusion or pneumothorax . Post-operative changes are similar along the right chest wall .
    OUTPUT:
    
Increasing left lung opacification which may reflect pneumonia superimposed on metastatic disease , although other etiologies such as lymphangitic pattern of metastatic spread could be considered . CT may be helpful to evaluate further if needed clinically .