Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy . The patient is rotated slightly to the left . Cardiac and mediastinal silhouettes are stable . There is increased opacity at the right lung bases , which could be due to pneumonia and / or aspiration . No large pleural effusion is seen . There is no evidence of pneumothorax . Mild pulmonary vascular congestion is seen .
    OUTPUT:
    
Mild pulmonary vascular congestion . Increased opacity at right lung base raises concern for pneumonia or aspiration . Persistent cardiomegaly .