Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates left basilar atelectasis . No focal consolidation is identified concerning for pneumonia . Cardiomediastinal contours are within normal limits . Patient is status post median sternotomy and valve replacement . No obvious large pleural effusion is identified . Osseous structures demonstrates no acute abnormality .
    OUTPUT:
    
No acute intrathoracic abnormality .