Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with chest radiographs from ___ , lung volumes have minimally improved and small opacity in the left lower lobe likely represents atelectasis . Left - sided AICD in place with dual leads in unchanged position . No focal consolidation , pleural effusion or pneumothorax . No central vascular congestion or overt pulmonary edema . There is mild calcification at the aortic knob . Multiple thoracic compression fractures with radiodensity in the upper lumbar spine , consistent with prior vertebroplasty .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Mild left lower lobe atelectasis . 3 . Unchanged multiple thoracic compression fractures .