Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . There is a small residual left pleural effusion and atelectasis , likely representing post-operative changes , which are unchanged from prior exam . There is no new focal mass , consolidation , or edema . The cardiomediastinal silhouette is moderately enlarged , unchanged from prior exam . There is no pneumothorax . Midline sternotomy wires are noted .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Stable small residual left pleural effusion and atelectasis , likely representing post-operative changes .