Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . There is an ill - defined opacity in the left base without clear correlate on the lateral view . Otherwise there is no consolidation , effusion , or pneumothorax . Cardiac and mediastinal contours are normal .
    OUTPUT:
    
Vague left base opacity may reflect soft tissue attenuation or infection in the correct clinical context . Subsequent CT shows clear lungs .