Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle nodular opacity projects over the left upper lung , wall overlying the posterior left sixth rib , new since the prior study from ___ . While findings may in part relate to overlap of structures , underlying pulmonary nodule is of concern . Recommend further assessment with chest CT . No focal consolidation is seen elsewhere . There is no pleural effusion or pneumothorax . Cardiac silhouette is top - normal to mildly enlarged . The aorta is calcified and tortuous . No overt pulmonary edema is seen .
    OUTPUT:
    
Subtle nodular opacity projecting over the left upper lung concerning for underlying pulmonary nodule . Recommend further evaluation with outpatient chest CT .