Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . Linear opacity at the left lung base suggestive of atelectasis versus scarring . There is biapical scarring . However it has significantly progressed on the right when compared to prior . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormality is detected .
    OUTPUT:
    
No acute cardiopulmonary process . Increased opacity at the right lung apex compared to prior while this may be due to apical scarring , given progression , dedicated nonurgent chest CT is suggested to further evaluate .