Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Wispy opacity abutting the left heart border is most likely atelectasis , less likely pneumonia . Otherwise the lungs are clear . No edema , effusion or pneumothorax . The cardiomediastinal silhouette appears normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Wispy opacity abutting the left heart border is most compatible with atelectasis , less likely early pneumonia . Please correlate with exam .