Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A dual lead pacer device is noted . There is an opacity at the left lung base , which most likely represents atelectasis . No focal consolidation , pleural effusion or pneumothorax . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities are identified . No free air under the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process . If there is high concern for a Pancoast tumor , CT scan is recommended