Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are exceedingly low , limiting evaluation and resulting in crowding of the bronchovascular structures . There is no pleural effusion , pneumothorax or focal airspace consolidation . Heart size is normal . The mediastinal and hilar structures are unremarkable .
    OUTPUT:
    
Within the limitations of this exam , there is no acute cardiopulmonary process .