Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is mildly enlarged , and accompanied by mild pulmonary vascular congestion . Streaky opacities are present in the left retrocardiac region , difficult to evaluate on this single portable view . Within the right lung , note is made of retrocardiac atelectasis and small right pleural effusion versus pleural thickening as well as chronic elevation of right hemidiaphragm . The patient is status post previous median sternotomy and coronary bypass surgery , and a dual lead pacing device remains in place .
    OUTPUT:
    
Streaky left lower lobe opacities , which could be due to mucoid impaction or peribronchial infiltration related to an infection . Standard PA and lateral chest radiographs may be helpful for more complete evaluation of this region when the patient 's condition permits .