Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . The heart size remains mildly enlarged . Mediastinal and hilar contours are unchanged . There is minimal upper zone vascular redistribution , similar to the prior study . Atelectasis is seen in the left lung base . No focal consolidation , pleural effusion or pneumothorax is identified . There are mild degenerative changes seen in the thoracic spine .
    OUTPUT:
    
Unchanged mild cardiomegaly with mild pulmonary vascular congestion . Left basilar atelectasis without focal consolidation to suggest pneumonia .