Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Lower inspiratory effort seen on the current exam . Linear retrocardiac opacity is seen likely atelectasis as it is not seen on the lateral view . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormality is detected .
    OUTPUT:
    
No definite acute cardiopulmonary process .