Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacer device is again noted with leads terminating in the regions of the right atrium and right ventricle . Lung volumes are persistently low . Heart size is mildly enlarged . The aorta remains tortuous and diffusely calcified . Crowding of bronchovascular structures is likely due to low lung volumes . No overt pulmonary edema is present . Patchy atelectasis is seen in the lung bases without focal consolidation . No large pleural effusion or pneumothorax is identified . The osseous structures are diffusely demineralized with multilevel moderate degenerative changes and dextroscoliosis .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .