Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph provided . Overlying EKG leads and epicardial pacing wires are present . There is elevation of the left hemidiaphragm , the chronicity of which is unclear . There is associated left basal atelectasis . Otherwise , the left lung is clear and the right lung is also clear . No large effusion or pneumothorax is seen . The heart size is difficult to assess but appears top normal . Mediastinal contour is unremarkable . Bony structures appear intact .
    OUTPUT:
    
Elevated left hemidiaphragm , unclear etiology or chronicity . Normal heart size .