Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hyperinflated and the diaphragms are flattened , consistent with COPD . The patient is status post sternotomy with mild cardiomegaly . Midline sternal wires are well aligned and intact . There is upper zone redistribution , without overt CHF . Bibasilar atelectasis is present , improved since the prior examination . There are small posterior effusions , likely bilateral . Exaggerated kyphosis of the upper thoracic spine is noted .
    OUTPUT:
    
Small bilateral pleural effusions . Patchy opacity of both lung bases is more suggestive of atelectasis , but the differential diagnosis could include early pneumonic infiltrates . No frank consolidation identified .