Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear without confluent consolidation . Blunting of left costophrenic angle could be due to small effusion or atelectasis . Prominence of the cardiomediastinal silhouette is likely accentuated by technique although there may be underlying cardiomegaly . Old healed posterior right rib fractures are noted .
    OUTPUT:
    
Blunting of the left costophrenic angle could be due to small effusion versus atelectasis . Otherwise no definite acute cardiopulmonary process .