Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . Calcified aortic knob is unchanged . The lungs are slightly underinflated , resulting in bronchovascular crowding . There is no pneumothorax , focal consolidation , or pleural effusion . Mild compression deformities within several mid-thoracic vertebra are unchanged since ___ .
    OUTPUT:
    
No acute intrathoracic process .