Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and mitral valve replacement . The heart size is normal . The mediastinal and hilar contours are unchanged . The pulmonary vasculature is normal . No focal consolidation , pleural effusion or pneumothorax is seen . Linear opacities within the left lung base likely reflect atelectasis . Previously seen cavitating nodules on chest CT are not well visualized on the current exam . There are no acute osseous abnormalities .
    OUTPUT:
    
Minimal left basilar atelectasis . Previously noted cavitating nodules on chest CT are not visualized on the current exam . As recommended on the prior chest CT , a followup chest CT in ___ is recommended .