Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes , clear lungs . No pleural effusion or pneumothorax . There is marked cardiomegaly as before . Postsurgical changes in the form of surgical sutures and sternotomy wires project over the mediastinum as before . No interval change in bony thorax .
    OUTPUT:
    
Low lung volumes , clear lungs with bilateral pleural effusions . Unchanged marked cardiomegaly .