Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . There is linear right mid - to - lower lung opacity most likely due to atelectasis versus scarring . Elsewhere , lungs are clear without consolidation or pulmonary vascular congestion . Mild blunting of the posterior costophrenic angles may be due to trace effusions or atelectasis . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormality is identified .
    OUTPUT:
    
No definite acute cardiopulmonary process .