Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy . Heart size is mildly enlarged , slightly decreased compared to the prior exam . Mediastinal contours are unchanged . There is mild pulmonary vascular congestion without overt pulmonary edema . Streaky atelectasis is noted in the lung bases . No pleural effusion , focal consolidation or pneumothorax is present . No acute osseous abnormalities seen .
    OUTPUT:
    
Mild pulmonary vascular congestion and mild atelectasis at the lung bases . No focal consolidation to suggest pneumonia .