Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable frontal view of the chest . The lung volumes are low . No pleural effusion or pneumothorax . There is bibasilar atelectasis , left greater than right . Heart size is normal . Mediastinal and hilar structures are unremarkable . The configuration of the trachea is unchanged from prior cross - sectional imaging .
    OUTPUT:
    
Low lung volumes without an acute cardiopulmonary process .