Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . The lungs are well expanded . There are subtle opacities in the left upper lobe , projecting over the anterior 3rd rib on the PA view , that radiate out from the left hilus . There is no focal consolidation , effusion , or pneumothorax . Cardiac and mediastinal contours are normal .
    OUTPUT:
    
Subtle left upper lobe opacity of uncertain significance . This could represent a small focus of sub - segmental bronchiectasis . If symptoms persist , repeat chest radiographs may be performed with PA , lateral , and bilateral shallow oblique projections . Findings were sent to the ED QA nurses via email at ___ ___ after discovery at ___