Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Minimal thickening is noted at the bilateral costophrenic angles , likely due to atelectasis versus trace effusion . There is no evidence of focal consolidation , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is within normal limits . A thin linear density projecting over the posterior right fourth rib is unchanged from ___ .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .