Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Crowding of the bronchovascular structures at the lung bases likely contributes to slightly increased opacification at both lateral lung bases . The lungs are grossly clear . A left pectoral pacemaker sends leads to the right atrium and right ventricle . There is no pneumothorax . Mild cardiomegaly and a small hiatal hernia are present . The bones are osteopenic . A partially imaged sclerotic lesion at the right humeral head is likely an enchondroma .
    OUTPUT:
    
Pacemaker sends leads terminate in the right atrium and right ventricle . Low lung volumes limits assessment of the lung bases . Repeat PA radiograph with improved inspiratory level is recommended when the patient 's condition permits Small hiatal hernia . Right humeral enchondroma .