Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume but appear clear with mild elevation left hemidiaphragm resulting in linear likely compressive left basilar atelectasis . No pleural effusion or pneumothorax is seen . The heart is stably enlarged . Dual lead pacemaker device noted in unchanged position . Cardiomediastinal contours are unchanged .
    OUTPUT:
    
No acute intrathoracic process .