Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . The previously detected opacity in the left lower lobe has essentially resolved with minimal linear density in its place likely representing atelectasis . No definite signs of pneumonia or CHF . The cardiomediastinal silhouette appears stable . Bony structures are intact .
    OUTPUT:
    
No acute intrathoracic process .