Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Pacer leads terminate in the right atrium and right ventricle . Lungs are generally hyperinflated . The left lower lobe is completely collapsed , and the atelectatic lobe is of small volume suggesting chronicity . Convexity of left infrahilar contour raises the possibility of an obstructing mass . There is an ill - defined opacity in the right apex that projects over the right second and third ribs , likely related to scarring as seen on the outside facility cervical spine CT performed on ___ . There is a small left pleural effusion . No pleural effusion on the right . No pneumothorax . Heart size is normal .
    OUTPUT:
    
1 . Left lower lobe collapse . Recommend chest CT to exclude an underlying malignancy . 2 . Small left pleural effusion .