Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided pacemaker is in place . The lead tips are unchanged , with both lead overlying the right ventricle . Note is made of a prosthetic aortic valve . There is mild cardiomegaly , unchanged . There is increased retrocardiac density and patchy opacity at the left lung base , consistent with left lower lobe collapse and / or consolidation , new compared with ___ . There is a slightly displaced fracture of the lateral left ninth rib . Lateral portions of the left tenth through twelfth ribs are excluded from this film . No gross right or left effusion is seen . No CHF . No pneumothorax is detected . Osteopenia and background degenerative changes noted .
    OUTPUT:
    
1 . Mild cardiomegaly , unchanged . Aortic valve again noted . 2 . Left - sided pacemaker with both lead tips overlying the right ventricle also again noted , unchanged . 3 . Increased retrocardiac density , consistent with lower lobe collapse and / or consolidation new compared with ___ . 4 . Slightly displaced left ninth rib fracture . The left tenth rib fracture identified on the ___ torso CT is excluded from this film . 5 . No pneumothorax or gross pleural effusion identified .