Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral radiographs of the chest were acquired . Lung volumes are slightly low . In the left lower lung , there is a focal patchy opacity , best appreciated on the frontal projection . The lungs are otherwise clear . The heart size is normal . The mediastinal contours are normal . There are no pleural effusions . No pneumothorax is seen . Multilevel degenerative changes of the thoracolumbar spine are noted . Lumbar spine hardware is incompletely evaluated . A left - sided pacemaker with right atrial and right ventricular leads is not significantly changed .
    OUTPUT:
    
Left lower lung focal patchy opacity concerning for either pneumonia or aspiration .