Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are extremely low in volume but appear clear . The cardiac silhouette is obscured by an elevated left hemidiaphragm , unchanged . The hilar contours and pleural surfaces appear normal . No definite pleural effusions are present .
    OUTPUT:
    
Limited examination due to extremely low lung volumes . Elevated left diaphragm is unchanged . No definite acute intrathoracic process .