Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post transcatheter aortic valve replacement as well as right - sided pacemaker placement with leads in unchanged positions in the right atrium and right ventricle . Left - sided Port - A - Cath tip terminates in the upper SVC . Heart size remains mildly enlarged . Mediastinal and hilar contours are unchanged . Low lung volumes result in crowding of bronchovascular structures without pulmonary edema . There is mild bibasilar atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Elevation of the right hemidiaphragm is chronic . There are mild degenerative changes in the thoracic spine . Chronic deformity of the proximal right humerus is incompletely imaged .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .