Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Patient is status post median sternotomy as well as cardiac valve replacement . As noted on the chest radiograph from ___ , similar in appearance to that study , there is suggestion of possible pulmonary nodules at the lung bases which may be due to overlapping structures ; however , chest CT would be needed for further evaluation . There is mild left base atelectasis / scarring . No large pleural effusion is seen . There is no pneumothorax . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Query basilar nodular opacities versus overlap of structures , similar in appearance to chest radiograph from ___ , chest CT would be needed for further evaluation , as also mentioned on that study . Left base atelectasis / scarring .