Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . Best seen on the lateral view is increased retrocardiac opacity compatible with wedge - shaped left lower lobe opacity on prior chest CT . Faint right basilar opacities are also seen suggesting atelectasis . There is no effusion . Superiorly , the lungs are clear . Known pulmonary nodules are not clearly delineated on this exam . Cardiac silhouette is mildly enlarged , likely accentuated by low lung volumes . No acute osseous abnormality is identified .
    OUTPUT:
    
Persistent left basilar opacity , better seen by recent chest CT .