Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower compared to the previous radiograph . A left - sided AICD / pacemaker device is again noted with leads in unchanged positions . Mild cardiomegaly with a left ventricular predominance is again seen . The mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Linear and patchy bibasilar opacities likely reflect areas of atelectasis . No pleural effusion or pneumothorax is clearly identified . Moderate multilevel degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Low lung volumes with patchy and linear opacities in the lung bases likely reflective of atelectasis . Infection in the left lung base however is not completely excluded in the correct clinical setting .