Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Subtle opacity in the left lung base may represent atelectasis ; however , a superimposed process such as pneumonia or apsiration is difficult to exclude . Minimal patchy opacity at the right base may represent atelectasis or changes related to early infiltrate or aspiration . No pleural effusion or pneumothorax is seen . There is calcification of the aortic knob . Although the mural calcification appears displaced inward , the appearance is unchanged compared with a chest CTA from ___ which showed adenopathy and meduastinal fat accounting for this appearance . The heart size is borderline . Incidental note made of orthopedic soft tissue anchor at coracoid process .
    OUTPUT:
    
Subtle opacity at the left - greater - than right - base may be chronic , but a superimposed process such as pneumonia or aspiration is difficult to exclude .