Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No focal consolidation , pleural effusion , or evidence of pneumothorax is seen . Projecting over the left upper lung between the posterior left ___ and ___ ribs , there is a subtle 6 mm nodule opacity which is not clearly seen on the prior study . The cardiac and mediastinal silhouettes are unremarkable . Hilar contours are stable .
    OUTPUT:
    
Subtle 6 mm ovoid nodular opacity projecting over the left upper lung , not clearly seen on prior studies . Suggest further evaluation with nonemergent chest CT . Oblique views may also provide further evaluation .