Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation of the lung fields is limited due to poor patient positioning and low inspiratory lung volumes . Within these limitations , there is mild opacification at the bilateral bases which may represent atelectasis in the setting of such low lung volumes ; however , superimposed infection can not be excluded in the appropriate clinical context . No large pleural effusion or pneumothorax is detected . There is no pulmonary edema . A right PICC is in place with the tip terminating in the low SVC . A left pectoral pacemaker is unchanged in appearance with two leads terminating in the right atrium and right ventricle . The cardiac silhouette is mildly enlarged but stable . The mediastinal and hilar contours are within normal limits and unchanged from ___ .
    OUTPUT:
    
Limited study due to technique and low lung volumes . Mild bibasilar opacification may represent atelectasis ; however , superimposed infection can not be excluded in the appropriate clinical context .