Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left pectoral pacemaker is noted in unchanged location with two leads terminating in the right atrium and ventricle , respectively . The cardiac silhouette is top normal . Mediastinal and hilar contours are within normal limits . Calcifications are seen within the aortic arch . Persistent , mildly hazy opacification of the bilateral lung bases is somewhat improved as compared to the prior examination , and may relate to underpenetration on technique . No definitive lobar consolidation is identified . A subtle , somewhat nodular opacity overlying the left lower lobe is noted . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . No focal lobar consolidation or pleural effusion is identified . 2 . Subtle , rounded opacity overlying the left lower lobe . Recommend repeat chest radiographs with nipple markers for further evaluation . 3 . Persistent bibasilar hazy opacification is somewhat improved from the prior examination . Findings may represent underpenetration secondary to technique .