Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Subtle opacity abutting the left heart border may represent a prominent fat pad or atelectasis . There is no convincing evidence for pneumonia . No pleural effusion or pneumothorax . Cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Wispy opacity abutting the left heart border likely represents atelectasis versus prominent fat pad . No convincing signs of pneumonia .