Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with earlier the same day , at 13 :45 and allowing for technical differences , no significant change is detected . No pleural effusion , pneumothorax or focal airspace consolidation . Possible atelectasis at left base . Heart is moderately enlarged but unchanged . Upper zone redistribution , but no overt CHF , as better seen on the recent CT thoracic spine . No displaced rib fracture detected on these lung technique films .
    OUTPUT:
    
Cardiomegaly and upper zone redistribution , but no other evidence of acute cardiopulmonary process . No significant change compared with film obtained earlier the same day . If concern for rib fracture persists , a rib series with markers would be recommended .