Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes . Moderate - to - large left pleural effusion is unchanged since ___ exam . Small - to - moderate right pleural effusion is also stable . Bibasilar opacities likely represent compressive atelectasis . Cardiac size is difficult to assess due to adjacent pleural effusions , and is likely enlarged . Hilar and mediastinal silhouettes are unchanged . Intrathoracic aorta , and mitral annulus calcifications are noted . There is no pneumothorax . Perihilar vascular congestion is noted . The patient is status post medial sternotomy .
    OUTPUT:
    
Moderate - to - large left and small - to - moderate right pleural effusions are essentially unchanged since ___ exam . Bibasilar opacities likely represent combination of pleural effusions and compressive atelectasis , underlying consolidation difficult to exclude .