Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded . There is an ill - defined faint opacity in the right upper lung projecting over the anterior third rib . No effusion , edema , or pneumothorax . The heart is top - normal in size . The mediastinum is not widened . There is a broad - based right pleural abnormality in the region of the right seventh posterior rib with slight asymmetric appearance of the chest wall soft tissue on the right compared to the left . No definite rib fractures are identified .
    OUTPUT:
    
Right pleural - based abnormality of uncertain etiology . Ill - defined faint opacity in the right upper lung projecting over the anterior right third rib