Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates intact median sternotomy wires . Patient is status post aortic valve replacement . Again seen is a pacemaker device projecting over the left anterior subcutaneous tissue with catheter tip within the right atrium and right ventricular apex . The lungs are hypoinflated with crowding of vasculature and bibasilar atelectasis . Stable mild cardiomegaly . No pleural effusion . No pneumothorax . Scar in the right upper lobe with associated surgical sutures are again noted . Mild retrocardiac opacity best assessed on frontal radiograph is most consistent with atelectasis and is similar to previous examination dated ___ . Limited assessment of the upper abdomen is unremarkable and visualized osseous structures are notable for anterior compression fracture of a lower thoracic vertebral body , unchanged from previous examination .
    OUTPUT:
    
1 . No evidence of pneumonia or congestive heart failure . 2 . Stable anterior compression fracture of a lower thoracic vertebral body , unchanged from previous examination .