Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates interval resolution of previously seen opacity in the left cardiophrenic angle , compatible with improved atelectasis . The lungs are clear . There is no pneumothorax , vascular congestion , or pleural effusion . The cardiomediastinal silhouette is within normal limits . Hardware related to prior posterior spinal fusion appears unchanged .
    OUTPUT:
    
Interval resolution of previously seen left basilar atelectasis .